SOLUTION: 1. From a bag containing 4 black balls and 5 white balls, two balls are drawn one at a time.(9pts) a. Find the probability that both balls are white. Assume that the first ball is

Algebra ->  Probability-and-statistics -> SOLUTION: 1. From a bag containing 4 black balls and 5 white balls, two balls are drawn one at a time.(9pts) a. Find the probability that both balls are white. Assume that the first ball is      Log On


   

Question 872016: 1. From a bag containing 4 black balls and 5 white balls, two balls are drawn one at a time.(9pts)
a. Find the probability that both balls are white. Assume that the first ball is returned before the second ball is drawn.
b. Find the probability of getting 1 black and 1 white in two consecutive draws
c. Find the probability of getting at least 1 black in 4 consecutive draws.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

9Balls: 4B, 5W

Assume that the first ball is returned before the second ball is drawn.

a) 2draws:  P(2W) = %285%2F9%29%284%2F9%29

b) 2 consecutive draws(w/o replacement):  P(B and W) = %284%2F9%29%285%2F8%29

c) 4 consecutive draws(w/o replacement): P(at least 1 B) = 1- P(no B) = 1- %285%2F9%29%284%2F8%29%283%2F7%29%282%2F6%29+