Question
How many 3-digit numbers each less than 600 can be formed from the digits $1,2,3,4,5$ and 9 , if repetition of digits is allowed?(a) 180(b) 160(c) 165(d) 185
Step 1
We need to find 3-digit numbers that are less than 600. This means the first digit (the hundreds place) can only be 1, 2, 3, 4, or 5, since using 6 or higher would result in a number that is 600 or more. Show more…
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