Post a New Question

Math

posted by .

A box contains 2 white calls and 7 pink balls. Two balls are drawn at random from the box.
a) If the first ball is drawn and not replaced, what is the probability that two balls will be drawn of different colors?
b) If the first ball is drawn and then put back, what is the probability that two balls will be drawn of different colors?

  • Math -

    P(WP) = (2/9)(7/8) = 7/36
    P(PW) = (7/9)(2/*) = 7/36
    Prob of your event = 7/36+7/36 = 7/18

    if ball is replaced,
    Prob(your event) = 2(2/9)(7/9) = 28/81

Answer This Question

First Name
School Subject
Your Answer

Related Questions

More Related Questions

Post a New Question