Using the digits 1 up to 9, two numbers must be made. The product of these two numbers should be as large as possible. All digits must be used exactly once. Which are the requested two numbers?
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9642 and 87531
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7642 and 87531
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9649 and 87531
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9642 and 87529
A
Correct answer
Explanation
To maximize the product, the numbers should be as close as possible in value and use higher digits in higher place values. 9642 and 87531 use all digits 1-9 once. 9642 * 87531 is the largest possible product among the choices.