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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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3 years ago
The volume of the above figure is?
Ne4ueva [31]
D. 2744 cm^3

Soultion no. 1

If you put the figure sideways you get a prism (with the two dark triangles as bases) and the formula for the volume is

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Solution no. 2

The figure has half the volume of a rectangular prism with sides 8, 14 and 49
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V = (8*14*49)/2 = 2744







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