You are here:

Advanced Math/Probability

Advertisement

Expert: Jack Cheng - 11/13/2006


Question
Two balls are taken out at random from a bag containing 6 red and 2 blue balls. Find the probability that just one ball is blue

Answer
Hi Hassan,

Probability is a ratio of expected over total possible.

In your problem, the total possible is 6+2 or 8. The expected is a blue ball, in which there are two in the total possible. So the ratio is 2/8 or 1/4.

I am not sure what form your teacher asks, but 1/4 can be changed to 25% or 0.25.

I hope this helps,
Jack

Advanced Math

All Answers

Answers by Expert:

Ask Experts

Volunteer

Jack Cheng

Expertise

I can answer most questions in Math up to single-variable Calculus, including infinite series. I like to think very much, so questions with a lot of twists and turns are highly welcomed! Mathematical questions related to computer science are also highly welcomed! I can also answer some basic questions in discrete mathematics (logics, sets, some algorithms, basic number theory). I am also studying physics (mechanics in particluar), so I am willing to answer some questions relating to it.

Experience

Majoring in Mathematics.

Education/Credentials
I am sophomore/junior status in college working towards bachelor's degrees in Computer Science and Mathematics.

©2012 About.com, a part of The New York Times Company. All rights reserved.