Question

A stack of 10 different cards are shuffled and spread out face down. If 3 cards are turned face up, how many different 3-card combinations are possible?

Answer 1

Answer:

120 different ways

Step-by-step explanation:

Using the combination formula as shown;

nCr = n!/(n-r)!r!

If a stack of 10 different cards are shuffled and spread out face down. If 3 cards are turned face up, the number of different ways 3cards combinations are possible is expressed as;

10C3 = 10!/(10-3)!3!

10C3 = 10!/(7)!3!

10C3 = 10*9*8*7!/7!*3*2

10C3 = 10*9*8/3*2

10C3 = 720/6

10C3 = 120 different ways

Hence there are 120 different card combinations

Answer 2

The different 3-card combinations that are possible are; 120 possible combinations

This is a combination probability problem with the formula;

nCr = n!/((n-r)!r!)

Where;

n is sample size

r is possible choice

In this case;

n = 10

r = 3

Thus;

The different 3-card combinations possible are;

10C3 = 10!/((10 - 3)!3!)

>> 10!/(7! × 3!)

>> 120

Thus,there are 120 possible combinations of 3 different cards.

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