Question

ward robe with three pairs of Flash in 15 shirts. and how many different ways could he select a slack and shirt combination

Answer 1

To find the answer, we have to use combinations

$C^r_{n^{}}=\frac{n!}{r!\cdot(n-r)!}$

Where n = 15 and r = 3.

$C^3_{15}=\frac{15!}{3!\cdot(15-3)!}=\frac{15\cdot14\cdot13\cdot12!}{3\cdot2\cdot12!}=\frac{2730}{6}=455$

Hence, there are 455 ways to select.