Question 1117622
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Note the other tutor counted some numbers that are 2 digits instead of 3....<br>
(1) There is only one choice (5) for the 3rd digit, since it must be divisible by 5.
(2) There are only 3 choices (1, 3, 5) for the first digit, since the number must be less than 600.
(3) The middle digit can be any of the 5 given digits.<br>
So the number of 3-digit numbers less than 600 that are multiples of 5 is<br>
(1)*(3)*(5) = 15