What is the probability of rolling an even number or a perfect square using a 20-sided die?

A) 10/20

B) 9/20

C) 12/20

D) 13/20

C) 12/20

Step-by-step explanation:

Between 1 and 20, 10 numbers are even, 4 numbers are perfect squares (1, 4, 9, and 16), and 2 numbers are both even and perfect squares (4 and 16).

So the probability is:

(10 + 4 - 2) / 20 = 12/20.