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OpenStudy (anonymous):
A 4-digit password is a number that begins with a 3. If digits can be repeated, how many possible passwords are there?
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OpenStudy (anonymous):
The hundreds digit can be anything from 0 to 9 (ten choices). The tens digit and the ones digit can also be any of ten different digits, since we are allowed to repeat digits. Therefore the answer is 1 times 10 times 10 times 10.
OpenStudy (anonymous):
so it's 1000?
OpenStudy (anonymous):
Perfect!
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