Homework Help: Math

Posted by Molly on Monday, November 15, 2010 at 10:05pm.

Four balls are simultaneously picked at random from a jar containing 2 red balls, 2 green balls, and 6 yellow balls.
What is the probability that exactly two of the selected balls will be red?

Math - Reiny, Monday, November 15, 2010 at 10:14pm
Using combination symbols,
prob = C(2,2)/C(10,2) = 1/45

or

prob = (2/10)(1/9) = 2/90 = 1/45
Math - Anonymous, Monday, December 3, 2012 at 8:45pm
it just says how many red balls are there

Answer this Question

Related Questions

Math - A bag contains 5 balls,8 white balls, 9 green balls,7 blue balls& 6 ...
Math for the middle school and elementary teacher - 3 red balls, 4 green balls, ...
probability - a bag contains 7 red balls, 4 green balls and 5 yellow balls. what...
statistics - Two urns each contain yellow balls and black balls. Urn 1 contains ...
Math-Probability - An urn contains four red balls and three white balls. A ...
Math - my problem is: From the box containing 5 red balls, 7 blue balls, 10 ...
Finite Math - An urn contains six red balls and five white balls. A sample of 2 ...
statistics - Suppose a box has eight differently colored tennis balls in it. The...
Finite Math - An urn contains sixteen red balls and seventeen white balls. A ...
math - Four balls are selected at random without replacement from an urn ...

For Further Reading

First Name:
School Subject:
Answer: