SOLUTION: Randomly draw a ball from a box which contains 3 red balls and 4 blue balls. Record the color of the ball drawn and put it back into the box. Repeat the above procedures 4 times. W

Algebra ->  Probability-and-statistics -> SOLUTION: Randomly draw a ball from a box which contains 3 red balls and 4 blue balls. Record the color of the ball drawn and put it back into the box. Repeat the above procedures 4 times. W      Log On


   

Question 843167: Randomly draw a ball from a box which contains 3 red balls and 4 blue balls. Record the color of the ball drawn and put it back into the box. Repeat the above procedures 4 times. What is the probability of getting at least one red ball out of these four trials?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

7 balls ; 3 red and 4 blue balls

ball is drawn and put it back into the box...

P(of drawing at least one red) = 1 - P(none) = 1 - %284%2F7%29%284%2F7%29%284%2F7%29%284%2F7%29