Numbered Balls

Problem of the Week - March 01, 2021

Numbered Balls Image

Nine balls numbered 1-9 are placed in a jar.  If three balls are drawn at random, without replacement, what is the probability that the sum of the numbers on the balls is odd?

Submit answer

Immediately after your correct answer is submitted, your name will be posted here.

Past problems
Individual Monthly & Annual Rankings
Leaderboard Monthly & Annual Rankings

Custom Leaderboards Are Here!

Take the competition to the next level and encourage participation by creating custom leaderboards for your students or friends to join. Click below to try it out now!

Get Started with Custom Leaderboards

Need Scratch Paper?

We encourage you to use the free online math software and mobile app from ClassPad as your digital scratch paper while solving the problems on our site!

Use ClassPad for digital scratch paper to solve this problem!