Question

How many ways are there to choose 6 shirts out of 10 to take to camp?

Answer 1

Answer:

d. $\displaystyle 210$

Explanation:

The keywords how many ways, signal combinations, especially since order does not matter, so we use the combination formula:

$\displaystyle \frac{n!}{[-r + n]!r!} =\: _nC_r \\ \\ \frac{10!}{[-6 + 10]![6!]} = \frac{3628800}{[4!][6!]} = \frac{3628800}{[24][720]} = \frac{3628800}{17280} = 210$

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* This is mathematics, not health.