How many different numbers
of 4 digits can be formed using the
digits 1,3,5,7 and 9 such that no digit
is repeated
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Step-by-step explanation:
If you have a four digit number and you are only able to use 1, 3, 5, 7, and 9, this means you have 4 x 4 x 4 x 4 x 4 = 16 x 16 x 4 = 256 x 4 = 1024.
So there are 1024 unique numbers created with the digits 1, 3, 5, 7 and 9.
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