Using the prime digits how many four-digit PIN can be created?

Question

Q. Using the prime digits how many four-digit PIN can be created?
A.16
B.24
C.64
D.128
E.256

jeffreyadcom · Answer

2,3,5,7 are the prime digits.

Each of the 4 digit pin can be 2/3/5/7.

So 4*4*4*4 = 256 combinations for the 4 digit PIN.

MartyTargetTestPrep · Answer

If you chose 24, notice that the question doesn't say that you can't repeat digits. So, the regular permutation formula doesn't work in this case.

jeffreyadcom · Answer

When the stimulus doesn't say it, its implied that the digits can be repeated.

A PIN, usually, can repeat digits. There is NO restriction to not repeat digits.

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