How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9}
Correct answer: A. 60
- A. 60
- B. 360
- C. 120
- D. 240
Explanation
Only 2 is even, so the units place is fixed as 2. The remaining three places can be filled from the other 5 digits in 5 x 4 x 3 = 60 ways. The likely trap is option c, 120, from allowing an even final digit that is not present in the set.
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