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If two digit number can have a repeated digit (eg 44) then there are 20 possible numbers, otherwise there are 16 possible numbers:

There are 4 single digit numbers;

With repeats allowed there are a further 4 x 4 = 16 two digit numbers making a total of 20;

Without repeats allowed there are a further 4 x 3 = 12 two digit numbers making a total of 16.

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