How many positive integers divide evenly into either $144$ or $196$ but not both?
divisors of 144
1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
Divisors of 196
1, 2, 4, 7, 14, 28, 49, 98, 196 count them ......
divisors of 144
1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
Divisors of 196
1, 2, 4, 7, 14, 28, 49, 98, 196 count them ......