Combanitorics-1
Probability
Level
2
There are seven 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 grandfather goes to park?
The answer is 35.
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1 solution
Grandfather goes to park as many times as he selects three children out of 7. Therefore, 7c3 I think it's an easy question for brilliants.