Question

For Exercises 51–60, use the following information:

U = x

A = x is an odd natural number less than 16

B = x

(Note: The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.) Find the cardinality of each set.

Answer

58.

n(B′)

Answer 1

15

Explanation:

We assume your "natural numbers" are positive integers. (Some authors also include zero.)

n(B) = 5

n(U) = 20

n(B') = 20 -5 = 15