Q. 53.7( 3 Votes )

We wish to select 6 persons from 8, but if the person A is chosen, then B must be chosen. In how many ways can selections be made?

Answer :

Formula:- (i)nCr


Given: -


Case 1: If A and B both are selected


=1x1x6C4



Case 2:If neither A nor B are selected


6C6


If B is selected but A is not selected


1x6C5



Adding above


15+1+6=22


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