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Earn 100

How many digit numbers have sum of digits .
(a)
(b)
(c)
(d)

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Important Questions on Permutation and Combination
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If is the number of all even divisors and is the number of all odd divisors of the number , then

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If and are the greatest divisors of and respectively for all , then

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EASY

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Consider the following statements
. Number of ways of placing objects in bins ) such that no bin is empty is
. Number of ways of writing a positive integer " ' into a sum of positive integers is
. Number of ways of placing ' ' objects in bins such that at least one bin is non-empty is
.

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