Permutation and CombinationHard
Question
The number of ways27 in which 20 volunteers can be divided into groups of 4,7 and 9 persons is-
Options
A.16C7 × 13C2
B.20C7 × 11C4
C.20C4 × 16C7
D.20C9 × 13C9
More Permutation and Combination Questions
Let Tn be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If Tn+1 - Tn = ...If n objects are arranged in a row, then the number of ways of selecting three of these objects so that no two of them a...The number of ways in which n distinct objects can be put into two different boxes is-...The exponent of 7 in 100! is -...Consider all permutations of digits 1,2,3.....9 such that sum of digits between -(i) 1 and 2 (including 1 and 2) is 12 (...