Question

See attached image. Thanks!

Answer 1

17

Explanation:

n(Band and Choir only)

= 25 - 11 - 7 - 3 = 4

n(Math and Band only)

= 7

n(Math and Choir only)

= 57 - (25 + 17 + 9)

= 6

Exactly 2:

4 + 7 + 6

= 17