Problem of the Week

Prime probabilities: Nov. 21, 2021 to Nov. 28, 2021

Two integers are said to be coprime if there is no prime number dividing both of them. What is the probability that two randomly chosen positive integers are coprime? Hint: You may find it useful to look up the value of a certain well known sum.

I enjoyed this problem:

Solution

Past Problem of the Weeks

Current Problem of the Week