A stack of 9 different cards are shuffled and spread out face down. If 4 cards are tired face up, how many different 4-card comb inations are possible?
1 answer:
Answer:
126.
Step-by-step explanation:
This is the number of combinations of 4 cards from 9 cards:
= 9C4
= 9! / 4! 5!.
A quick way of calculating this is
9*8*7*6
----------- = 9*2*7 = 126 combinations.
4*3*2*1
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