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Which numbers in the following set are prime numbers: (4,7,31, 117, 324)?

Answer 1

Jeremiah Andrews

#7# and #31# are prime numbers.

A prime number is a natural number greater than 1 which is only divisible by #1# and itself.

From the set #4# and #324# cannot be prime, because they are even.

The remaining numbers are #7,31# and #117#

#117# can be written as #117=3xx39=3xx3xx13=3^2xx13#, so it is also not a prime number.

Remaining numbers are #7# and #31# and they are prime numbers.

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Answer 2

Mila Anderson

The prime numbers in the set are 7 and 31.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.