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Can you find a five-digit number...

...whose digits add up to 18 and whose product is 210 and the digits increase from left to right in the number?

Puzzle Copyright © Kevin Stone

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Answer

12357.

Reasoning

Since 210 = 2 x 3 x 5 x 7, 12357 is the only way to get a 5-digit number, in ascending order.

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