Question

The sum of two prime numbers is 85. What is the product of these two prime numbers?

Answer 1

`166`

Explanation:

There is only one even prime number, viz `2`.

The sum of two odd numbers is an even number.

`85` is odd, so is the sum of an odd number and an even number.

So the only pair of (positive) prime numbers of which it can be the sum is `2` and `83`.

`2 xx 83 = 166`