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18.You can answer it easily by considering three places for three digits of the number.The hundreds place cannot take zero hence it can take 2 values.The next two places can take all the three digits.Hence the total number of ways is 2*3*3=18.
0.12 Or 102 if you do not want to include non integers.
There are infinitely many perfect numbers so they cannot all be listed.
Since there are infinitely many numbers, there can be no answer.
The smallest 3 digit counting number less than 1000?? 100