The number of three digit numbers which use only the digits 0,1, and 5 is; 18.
How many three digit numbers use 0,1 and 5?
Since, it follows from the task content that three digit numbers are to be considered, Hence, it follows that the choice for the first digit is between 1 and 5, for the second number and third number, the choice lies within all three numbers.
On this note, we have;
= 2× 3 × 3.
= 18.
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