Question 1040030
prime numbers of concert:
2,3,5,11,13
There are 20 possible draws, 4 from the first and each of those paired with 5 from the second.
1+2
1+4
3+2
3+4
3+8
5+2
5+8
6+7
There are 8 of 20, so 2/5 or 40%.