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3 digit numbers are lessthan 4 digit numbers
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.
A 3 or 4 digit number.
5
Any multiple of 20 between 100 and 980 inclusive.