Question

The diagram represents three statements about animals at the zoo: p, q, and r.



For how many animals is (p ∨ q) ∧ r true?

15
17

Answer 1

(p ∨ q) ∧ r means r is true and at least one of p or q is true — so count all animals in the r circle except those with r only. The diagram shows 17 animals with r in total, of which 2 are r-only, so 17 − 2 = 15.

Answer: 15.