Discussion
If in each number, the first and third digits are interchanged and then how many even numbers are there after the interchange?
Answer: C
There are two even numbers.
Swap the first and third digits of each number:
324 → 423, 456 → 654, 572 → 275, 683 → 386, 726 → 627, 132 → 231.
A number is even when its last digit is even; after the swap, the last digit is the old first digit. Only 654 and 386 end in an even digit, so the count is two.
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