# Finding the odds

• Nov 12th 2009, 10:15 PM
bball20
Finding the odds
A bag contains 13 balls numbered 1 through 13. What are the odds in favor of selecting a ball that has an even number?
• Nov 12th 2009, 10:42 PM
mr fantastic
Quote:

Originally Posted by bball20
A bag contains 13 balls numbered 1 through 13. What are the odds in favor of selecting a ball that has an even number?

Pr(even number) = 6/13. Now apply your definition of odds ....
• Nov 12th 2009, 10:42 PM
Twig
Hi

Even numbers: 2,4,6,8,10,12

Odd numbers: 1,3,5,7,9,11,13

There are 6 even numbers and 7 odd numbers.
So the odds are:

even : odd -> 6:7

Or $P(\mbox{ Ball with even number }) = \frac{6}{6+7}$