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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    a. A box contains three white balls and two red balls. A ball is drawn at random from the box and not replaced. Then a second ball is drawn from the box. Draw a tree diagram for this experiment and find the probability that the two …
  2. math

    A box contains three white balls and two red balls. A ball is drawn at random from the box and not replaced. Then a second ball is drawn from the box. Draw a tree diagram for this experiment and find the probability that the two balls …
  3. math

    A box contains 6 red balls, 4 white balls, and 5 green balls. If three balls are drawn in succession without being replaced, what is the probability that they are drawn in the order red, white, green?
  4. statistics

    A box contains 3 white and 5 black balls. Four balls are drawn at random "with replacement" from the box (i.e. selected balls are returned to the box and mixed, before drawing the next ball). Let X be the number of black balls drawn. …
  5. Math

    A bag contains 5 red balls and 4 white balls. Two balls are drawn at random from the bag. The first ball drawn is put back into the bag before the second ball is drawn. What is the probability that two balls drawn are both red?
  6. Math

    A bag contains 5red balls and 4 white balls. Two balls are drawn at random from the bag. The first ball drawn is put back into the bag before the second ball is drawn. What is the probability that the two balls drawn are both red?
  7. Statistics

    3 balls are drawn successively from a box containing 6red,4 white and 5 blue balls.Find the probability that they are drawn in order red,white and blue if:(a)each ball is replaced.(b)balls are not replaced
  8. pshs

    three balls are drawn successively from a box containing 6 red balls,4white balls and 5 blue balls. find the probability that tare hey drawn in the order red,white and blue if each ball is replaced?
  9. statistics /pure maths

    A box contains N identical balls of which 4 are Red, 3 are Green and the rest are White . If 3 balls are drawn at random one after the other without replacement.the probability that all 3 balls are Whit is 1/22. 1.Find the number of …
  10. Math

    A bag contains 5 red balls, 4 white balls, and 3 black balls. Two balls are drawn without replacement. What is the probability that at least one ball drawn is white?

More Similar Questions