Concept explainers
For Exercises 51–60, use the following information:
U = {x | x is a natural number less than 20}
A = {x | x an odd natural number less than 16}
B = {x | x is a prime number greater than 5}
{Note: The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19}. Find the cardinality of each set.
55. n(A ∩ B′)
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