Can you help me with this...

Use geometric terms to describe how a rectangular prism and a cube are different.

Ken is about to eat a bag of M&M's on the 4th of July. The number of each color M&M is listed below.

Green 11
Red 8
Yellow 13
Tan 7
Brown 10
Blue 5

a)If Ken picks the first M&M out of the bag without looking. What is the chance he will pick a brown one to match his eyes?

b)What is the chance his first one will match a color in the America flag?