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The sum of two number is 25 and their difference is 13. Find their product.

104
114
315
325

Correct Answer: 114

Explanation:

Let the numbers be x and y.

Then, x + y = 25 and x - y = 13.

4xy = (x + y)² - (x- y)²

= (25)² - (13)²

= (625 - 169)

= 456

∴ xy = 114.

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