If x and y are between 1 and 20, inclusive, do x and y have a common prime factor?
1). x=y+1
2). y is odd
1). x=y+1
2). y is odd
Look at the prime factors for the number between 1 and 20
2 --> 2
3 --> 3
4 --> 4
5 --> 5
6 --> 2 and 3
7 --> 7
8 --> 2
9 --> 3
10 --> 2 and 5
11 --> 11
12 --> 2 and 3
13 --> 13
14 --> 2 and 7
15 --> 3 and 5
16 --> 2
17 --> 17
18 --> 2 and 3
19 --> 19
1) No, see above SUFFICIENT
2) no info about A INSUFFICIENT
