# Thread: Probability that two integers selected at random are prime to each other.

1. ## Probability that two integers selected at random are prime to each other.

What is the chance that two integers selected at random are prime to each other ? Please help me in solving it

2. ## Re: Probability that two integers selected at random are prime to each other.

It is not clear what probability measure to use on subsets of natural numbers.

3. ## Re: Probability that two integers selected at random are prime to each other.

Simple example: 5,10,15
5,10
5,15
10,15 ***

Probability is 1/3; is that what you mean?