Permutation and CombinationHard

Question

Number of ways in which 9 different toys be distributed among 4 children belonging to different age groups in such a way that distribution among the 3 elder children is even and the youngest one is to receive one toy more, is:

Options

A.
B.
C. 
D.none

Solution

Here first three children receive 2 each and younger receives 3 toys
then total 3 toys
then total number of distribution is
9C2 . 7C2 . 5C2 . 3C2

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