Question

A person going to a party was asked to bring 2 different bags of chips. Going to the store, she finds 9varieties.How many different selections can she make?

Answer 1

Answer:

She can make 36 different selections

Explanation:

Total number of selection = 2

Sample = 9

$\begin{gathered} 9C2=\frac{9!}{(9-2)!2!} \\ \\ =\frac{9!}{7!2!} \\ \\ =\frac{9\times8\times7!}{7!\times2\times1} \\ \\ =\frac{9\times8}{2\times1} \\ \\ =9\times4=36 \end{gathered}$

She can make 36 different selections