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math ,correction

posted by on .

Is this correct?

consider determining how many possible phone numbers are in an area code (repeated numbers allowed)

Is this a combination, a permutation, or neither?

I think it would be a combination wouldn't it?

Since there are ten number possibilities in each of the three spaces of the area code and repeats are allowed, there are 10^3 (1000) possible permutations.

To distinguish combinations from permutations, see the following sources:

I hope this helps. Thanks for asking.

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