Description : The sum or difference of of two irrational numbers is always (a) rational (b) irrational (c) rational or irrational (d) not determined
Last Answer : (b) irrational
Description : The product of two different irrational numbers is always (a) rational (b) irrational (c) both of above (d) none of above
Description : The sum of a rational and irrational number is (a) rational (b) irrational (c) both of above (d) none of above
Description : The product of a rational and irrational number is (a) rational (b) irrational (c) both of above (d) none of above
Description : If somebody choose two digit and three digit numbers and their difference is 989.What will be their sum? a) 1000 b)1010 c) 1006?
Last Answer : None of the above. Let x be the three digit number and y be the two digit number. x - y =989. x = 989 + y. x is obviously greater than 989 and less than 1000 (since it is three digits). Since y is a two digit number ... 989 + 10 = 999. We can't go any higher, so x =999 and y=10. x+y = 999+10 = 1009
Description : Now it was Ravi‘s turn. He rolled the dice. What is the probability that he got the sum of the two numbers appearing on the top face of the dice is greater than 8? a. 1 b. 5/36 c. 1/18 d. 5/18
Last Answer : d. 5/18
Description : Rahul got next chance. What is the probability that he got the sum of the two numbers appearing on the top face of the dice is equal to 7? a. 5/9 b. 5/36 c. 1/6 d. 0
Last Answer : c. 1/6
Description : Now it was Ravi‘s turn. He rolled the dice. What is the probability that he got the sum of the two numbers appearing on the top face of the dice is less than or equal to 12? a. 1 b. 5/36 c. 1/18 d. 0
Last Answer : a. 1
Description : Rahul got next chance. What is the probability that he got the sum of the two numbers appearing on the top face of the dice is 13? a. 1 b. 5/36 c. 1/18 d. 0
Last Answer : d. 0
Description : Two dice are thrown together. Find the probability that the sum of the numbers obtained is even a. 1/4 b. 1/6 c. 1/3 d. 1/2
Last Answer : d. 1/2
Description : If 4! = 1x2x3x4 and is called 4 factorial, what is the sum of the numbers e.g. 4(?)= (1+2+3+4) called?
Last Answer : What’s wrong with the summation notation? It does just that. I don’t think there’s any other way of expressing it other than writing it out. [addition]: After more research, I found a formula where 1+2+3+4….+n= n*(n+1)/2 http://en.wikipedia.org/wiki/Triangular_number
Description : Give two examples to show that the product of two irrational numbers may be a rational number . -Maths 9th
Last Answer : Take a = (2+ √3) and b =(2 - √3 ); a and b are irrational numbers, but their product = 4-3 = 1, is a rational number. Take c = √3 and d = -√3; c and d are irrational numbers. but their product = -3, is a rational number.
Description : How many rational numbers and irrational numbers can be inserted between 2 and 3 ? -Maths 9th
Last Answer : There are infinite number of rational and irrational numbers between 2 and 3 .
Description : Identify the following as rational or irrational numbers .Give the decimal representation of rational numbers. -Maths 9th
Last Answer : In this way we can represent a rational numbers
Description : In the following equations , find which of the variables x, y, z etc. represent rational numbers and which represent irrational numbers -Maths 9th
Last Answer : Following are the rational numbers which represent irrational numbers .
Description : Examine , whether the following numbers are rational or irrational : -Maths 9th
Last Answer : ∴ It is an irrational number .
Description : Examine whether the following numbers are rational or irrational: -Maths 9th
Last Answer : 1 irrational no. 2 rational no. 3 irrational no.
Description : Let x and y be rational and irrational numbers, respectively. -Maths 9th
Last Answer : Yes, (x + y) is necessarily an irrational number.
Description : Classify the following numbers as rational or irrational with justification . -Maths 9th
Last Answer : Classification of rational or irrational number with justification
Description : Find which of the variables x, y, z and u represent rational numbers and which irrational numbers. -Maths 9th
Last Answer : Rational number and irrational number
Description : Classify the following numbers as rational or irrational and give justification of your answer. -Maths 9th
Last Answer : (i) 0.05918 is a rational number as decimal expansion is terminating. (ii)1.010010001.... is an irrational number as decimal expansion is non-terminating non-recurring(non-repeating). (iii) √9/27 = √1/3 = 1/ ... it is an irrational number. (iv) √12/75 = √4/25 = 2/5, which is a rational number.
Description : What is the difference between rational and irrational numbers ?
Last Answer : rational , irrational is the classification of real numbers. Before we talk about them , first let's talk about p / q size. p / q is a fraction where p and q will meet two conditions-- ( i) Both p and q can be any positive or negative integer ... ................................................ ....
Description : The decimal expansion of the rational number 23/(2 2 . 5) will terminate after (a) one decimal place (b) two decimal places (c) three decimal places (d) more than 3 decimal places
Last Answer : (b) two decimal places
Description : In the following figure ABCD is a cyclic quadrilateral, the sum of degree measures of ∠A and ∠D is: (SOURCE: Fig. 3.7, Exercise 3.7, Chapter 3, PAIR of LINEAR EQUATIONS in TWO VARIABLES, NCERT, Class X) (a) 120° (b) 180° (c) 230°(d) 250°
Last Answer : (c) 230°
Description : The square of a two digit number is divided by half the number. After 36 is added to the quotient, this sum is then divided by 2. The digits of the resulting number are the same as those in ... 's place of the original number is equal to twice the difference between its digits. What is the number?
Last Answer : Answer: 46
Description : So, I think my mind just broke. Why is the sum of all integers -1/12?
Last Answer : answer:The video lost me about 40 seconds in then he made this leap from 1+2+3+4… to 1+ x2 + 2x squared and so on. That may be obvious to a mathematician, but to me it was a giant leap of faith. And logically it doesn’t make sense either. So I am just as confused as you are.
Description : What is the sum of this infinite series?
Last Answer : To have a sum, you’d need to know when to stop adding, an end point. An infinite problem, by definition, does not have that. A similar problem might be, what’s 1+2+3+4… forever.
Description : How many combinations with three different colored die can you make the sum 15?
Last Answer : 10. Try it for yourself and see.
Description : If α and β are the zeroes of the polynomial 5x 2 – 7x + 2, then sum of their reciprocals is: (a) 14/25 (b) 7/5 (c) 2/5 (d) 7/2
Last Answer : (d) 7/2
Description : Find the smallest number in a GP whose sum is 38 and product 1728? (a) 12 (b) 20 (c) 8 (d) none of these
Last Answer : (c) 8
Description : The sum of three consecutive integers is 36. What is the largest of the three integers? The correct answer is 13.?
Last Answer : The sum of three consecutive integers is 36. (x - 1) + x + (x + 1) = 36 13 is the largest of the three integers.
Description : If m and n are two odd prime numbers such that m (a) an even number (b) an odd number (c) an odd prime number (d) a prime number
Last Answer : (a) an even number
Description : H.C.F of two prime numbers is (a) 1 (b) 0 (c) 3 (d) 2
Last Answer : (a) 1
Description : To the nearest 10%, what percentage of all numbers contain a 9?
Last Answer : You probably need to clarify that you mean what percentage of the set of all integers contains the digit 9'? Because there are an infinite number of numbers that don't contain that digit (and ... is also an infinite set of digits that does not. Maybe you need to restrict your range some more.
Description : Is the previous result of lotteries useful for predicting the numbers of a lottery ticket?
Last Answer : No. Every time is random.
Description : What's the longest known sequence of non-prime numbers?
Last Answer : My guess would be that such sequences grow in length with as number size gets larger. Prime numbers become increasing scarce as numbers get larger, making it more likely to find long sequences of primes.
Description : Brain Teaser - Indivisibility properties of sequence of numbers?
Last Answer : Mmmm homework =)
Description : Brain Teaser - Working with numbers that don't divide into one another?
Last Answer : 1) Write all of those numbers in the form: 2^k * m where m is an odd integer and k is a non-negative integer. Obviously m < 50. Since we have 25 odd numbers less than 50 if we pick 26 numbers between 1 and ... and hence n is at least 3 m. Hence k is larger than l. For (3) I should think a bit more.
Description : The least number that is divisible by all the numbers from 1 to 5 is: (a) 70 (b) 60 (c) 80 (d) 90
Last Answer : (b) 60
Description : If a number x is chosen at random from the numbers -2, -1, 0 1, 2. What is the probability that x 2 < 2? a. 2/5 b. 3/5 c. 1/4 d. 4/7
Last Answer : b. 3/5
Description : A number is selected at random from first 50 natural numbers. Find the probability that it is a multiple of 3 and 4. a. 3/25 b. 2/25 c. 1/25 d. 13/50
Last Answer : b. 2/25