In a survey of $80$ people, $50$ liked tea, $40$ liked coffee, and $20$ liked both. The number who liked at least one is

Question

Aicharya · Accepted Answer

$n(A \cup B) = 50 + 40 - 20 = 70$.

In a survey of $80$ people, $50$ liked tea, $40$ liked coffee, and $20$ liked both. The number who liked at…