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1. a + b = 4, a - b = 2 হলে ab এর মান কত?

  • A. 8
  • B. 8
  • C. 8
  • D. 8

Answer: Option B

Explanation:

দেওয়া আছে, a + b = 4 3a - b = 2
আমরা জানি, 
4ab = (a + b)2 – (a – b)2
=4^2−2^2
= 16 - 4 = 12 
.:. ab = 12/4= 3

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