# Which of these numbers is a prime number 1, 11, 21, 51?

11 is a prime number.

By defintion a prime number is a number greater than one and the only whole numbers it can be divided by to provide a whole number quotient are 1 and itself. 1 is not greater than one so it is not a prime number. 11 is only divisible by 1 and 11, it is a prime number. 21 is visible by 1, 3, 7, and 21; not a prime number. 51 is divisble by 1, 3, 7, 17, and 51; not a prime number.

11 is the only prime number .

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The prime number among the given numbers is 11.

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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.

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.

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.

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