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1. a + b =8 এর a-b=2 হলে, ab এর মান কত?

  • A. 4
  • B. 4
  • C. 4
  • D. 4

Answer: Option C

Explanation:

ab=(a+b)²-(a-b)²/4=82-22/4=64-4/4=60/4=15

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