Question

Pratt has 6 pokemon cards but he can only show 3 to his friends how many different choices of pokemon cards can he choose?

Answer 1

just a try..okay .... we can use combination that is choosing 3 cards out of 6 ....so, C (6,3) = 6 ! / (3!. 3!) = (6*5*4 ) / (3*2*1) = 20 ... so, answer should be 20.