Answer:
Option B is the answer.
Step-by-step explanation:
I own 6 hats and i am taking 4 hats on vacations.
I have to find the number of ways that I can choose 4 hats out of 6.
In this question we will apply the combination rule.
So by combination rule number of ways to choose hats will be \(^{6}C_{4}\)
\(^{6}C_{4}=\frac{6!}{(6-4)!(4)!}\)
\(=\frac{6\times 5\times 4!}{2!\times 4!}\)
\(=\frac{30}{2}\)
=15
Therefore, option A. 15 will be the answer.
