Discuss Forum

1.

a+b=5 এবং a-b=3 হলে ‍ab এর মান কত?

  • A. 2
  • B. 2
  • C. 2
  • D. 2

Answer: Option C

Explanation:

ab = (a + b)2 - (a - b)2/4
= 25 - 9/4
= 16/4
= 4

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