Number of ways in which three distinct numbers can be selected between 1 and 20 both inclusive, whose sum is even is

Number of ways in which three numbers in AP can be selected from 1,2,3, . .,n is

The number of ways in which n distinct balls can be put into three boxes, is

The number of ways in which four letters can be selected from the word degree, is

The total number of ways in with three distinct numbers in A.P.can be selected from the set {1,2,3,............24} is equal to a.66 b.132c 198d.none of these

Given that n is odd, number of ways in which three numbers in AP can be selected from 1, 2, 3,……., n, is

Find the number of ways in which 5 distinct balls can be distributed in three different boxes if no box remains empty.

The number of ways in which five distinct objects can be put into three identical boxes so that no box remains empty is

Number of ways in which three numbers in A.P.can be selected from 1,2,3,...,n is a.((n-1)/(2))^(2) if n is even b.n(n-2)/(4) if n is even c.((n-1)^(2))/(4) if n is odd d.none of these

There are 10 different books in a shelf. The number of ways in which three books can be selected so that exactly two of them are consecutive is