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If all the digits within each number are arranged in ascending order from left to right, then how many numbers will become even numbers?

1. Three
2. Four
3. Two
4. One

Correct answer: Two

Solution

When the digits of each number are arranged in ascending order, the parity of the resulting number depends on its last digit. Checking all the given numbers, only two of them end with an even digit after rearrangement, so two numbers become even.

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