What do you mean by Co-ordinate Geometry? -Maths 9th

What do you mean by Co-ordinate Geometry? -Maths 9th
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(a) \(rac{2^n}{5^n}\)In any number the last digits can 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. Therefore, the last digit of each number can be chosen in 10 ways. ∴ Exhaustive number of ways = 10n. If the last digit be 1, 3, 7 or 9, none of the numbers can be even or end in 0 or 5. That is, there is a choice of only 4 digits for the last digit of each of these n numbers. So, favourable number of ways = 4n ∴ Required probability = \(rac{4^n}{10^n}\) = \(rac{2^n}{5^n}\).
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