Question

What is the probability of rolling a prime number on a 12 sided dice numbered 1 to 12?

Answer 1

`5/12` or `.41bar6`

Explanation:

A prime number is a number (greater than 1) that has no divisors besides 1 and itself.

When rolling this dice, you could get

`1, color(red)(2), color(red)(3), 4, color(red)(5), 6, color(red)(7), 8, 9, 10, color(red)(11), 12`

The prime numbers are in red. (Remember, 1 is not considered a prime number.)

5 out of 12 of these numbers are prime. Therefore, the probability of rolling a prime number on this dice is

`5/12` or `.41bar6`