Post a New Question

College Math

posted by .

A bucket contains orange tennis balls and yellow tennis balls from which 5 balls are selected at random, but assume that the bucket contains 7 orange balls and 6 yellow balls.


(1) What is the probability that, of the 5 balls selected at random, at least one is orange and at least one is yellow?

(2) What is the probability that, of the 5 balls selected at random, at least two are orange and at least two are yellow?

  • College Math -

    (1) From 1, subtract the probability that none are yellow and the probability that none are orange. Every other possibility has one or more of both.
    All orange probability = (7/13)(6/12)(5/11)(4/10)(3/9) = 0.0163
    All yellow probability = (6/13)(5/12)(4/11)(3/10)(2/9) = 0.0047
    1-0.0163-0.0047 = 0.979

    (2) See what you can do using a similiar method.

  • College Math -

    Thanks! I am still working on the second part.. and having a difficult time... but I am sure I will eventually figure it out. :)

  • College Math (2) -

    From one, subtract the probabilities of:
    (1) zero or one orange, (2) zero or two yellow and (3) one orange and one yellow.
    Zero orange (all yellow):0.0047
    Zero yellow (all orange):0.0163
    One orange (4 yellow)): 5x(6/13)(5/12)(4/11)(3/10)(7/9)= 0.08159
    One yellow (4 orange): 5*(7/13)(6/12)(5/11)(4/10)(6/9)= 0.1632
    1-0.0047-0.0163-0.0816-0.1632 = 0.8974

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question