Glen J. answered • 07/16/14

Tutor

New to Wyzant
Teacher for PreAlgebra to Calculus

In one draw the prob that a draw is negative is 48/120 = 2/5. Thus the prob that a draw is not negative = 3/5

The formula would be

120

**C**X * (2/5)^X*(3/5)^(120-X)