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1. 16

  • A. 12
  • B. 12
  • C. 12
  • D. 12

Answer: Option B

Explanation:

আমরা জানি,

               4ab = (a + b)² - (a - b)²

                      = (√16)² - (√9)²

                      = 16 - 9

                      = 7

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