How many two-digit numbers have non-zero digits whose sum is prime?
If I didn't miss any !!!!
11, 12, 14, 16
21 , 23 , 25, 29
32 , 34, 38
41, 43, 47 , 49
52, 56, 58
61, 65, 67
74, 76
83, 85, 89
92, 94, 98
