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1.


a+b=7 এবং  a 2 + b 2 = 25   হ ল   5 a b     এ র   মান কত হবে

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

Answer: Option A

Explanation:

a2+b2=25

বা, (a+b)2-2ab=25

বা, 7*2-2 ab= 25

বা, 2ab= 49-25

বা, 2ab=24

বা, ab= 12 Ans.

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