Question

How many numbers can you get by multiplying two or more members of the set {1,2,3,5,11} together?

Answer 1

There are 11 different ways 
1)1*1=1
2)1*2=2
3)1*3=3
4)1*5=5
5)1*11=11
6)2*2=4
7)2*3=6
8)2*5=10
9)2*11=22
10)3*5=15
11)3*11=33
12)5*11=55