Answer :

A power is how many times a number is multiplied by itself. So for 3, the number given, the values are as follows:
3x3=9
3x3x3=27
3x3x3x3=81
3x3x3x3x3=243
3x3x3x3x3x3=729
The next power will be greater than 1000 and therefore out of the range given.

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