Discussion

If A = {x : x is a prime number less than 10}, find the cardinality of A.

Answer: B

We need to list the prime numbers less than 10.

Prime numbers are natural numbers greater than 1 that have no positive divisors other than 1 and themselves.

The prime numbers less than 10 are 2, 3, 5, and 7.

So, A = {2, 3, 5, 7}.

The cardinality of A, denoted n(A), is the number of elements in the set, which is 4.

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