patmiller1803 patmiller1803

07-04-2019
Mathematics

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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 combinations are possible?

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Аноним Аноним

07-04-2019

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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