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1. Two numbers differ by 5. If their product is 336, then the sum of the two numbers is -
- A. 21
- B. 21
- C. 21
- D. 21
Answer: Option B
Explanation:
(x + y)² = (x - y)² + 4xy
= 5² + 4×336
= 25 + 1344
= 1369
∴(x + y) = 37
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