10x=180
x=18
Angle B: 18(6)=108
Angle A: 18(2)=36
Angle C: 18(2)=36
**Angle C would equal 36**
There are 6 choose 3 possibilities (combinations).
6C3 = 6!/(6-3)!3!
= 6•5•4/(3•2•1)
= 120/6
= 20
With 20 possibilities, there is a 1 in 20 chance that she will choose her favorite three.
The answer is Option C. 1/20.