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Luda [366]
3 years ago
11

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?
Mathematics
1 answer:
Juliette [100K]3 years ago
7 0

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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Hi there!

<u>Here are all the steps into solving this equation :</u>

\frac{9z+4}{5} <u>- 8</u> = 5.4

Add 8 on each side of the equation → 5.4 + 8 = 13.4

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Multiply each side of the equation by 5 → 13.4 × 5 = 67

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Divide each side of the equation by 9 → 63 ÷ 9 = 7

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There you go! I really hope this helped, if there's anything just let me know! :)

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