Combinatorics -2
Probability
Level
3
There are 7 children in a family.Their grandfather takes them to a park making a group of three at a time such that no same group of three goes again with him( a different group every time). Then tell how frequent each child goes??
The answer is 15.
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1 solution
look its the easiest problem i ever solved subract the case when we have to select 3 children from 7 and 3 children from 6 35-20=15