Brain Teaser - Indivisibility properties of sequence of numbers?

Brain Teaser - Indivisibility properties of sequence of numbers?
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Mmmm homework =)
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In an operating system, indivisibility of operation means : (A) Operation is interruptable (B) Race - condition may occur (C) Processor can not be pre-empted (D) All of the above

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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?

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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

To the nearest 10%, what percentage of all numbers contain a 9?

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If 4! = 1x2x3x4 and is called 4 factorial, what is the sum of the numbers e.g. 4(?)= (1+2+3+4) called?

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