How many 3-digit even numbers can be made from the digits 0, 1, 2, 3, 4 if no digit is used twice?
Answer and explanation
Correct answer: D. 30
- Step 1: Fix the last digit first (it must be even), then fill the first digit (not zero), then the middle digit.
- Step 2: Counting all valid choices gives numbers.
Answer
30.
Why not the others: 48: the evenness condition is ignored. 60: leading zeros and evenness are ignored.
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