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1. a + b = 9, a - b = 7 হলে ab এর মান কত?

A. 6
B. 6
C. 6
D. 6

Answer: Option C

Explanation:

আমরা জানি,

a b = {(\frac{a + b}{2})}^{2} - {(\frac{a - b}{2})}^{2}

Answer : 8

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