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1. a2+b2=25

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

Answer: Option A

Explanation:

a2+b2=25

>(a+b)2-2ab=25

>7*2-2 ab= 25

>2ab= 49-25

>2ab=24

>ab= 12 Ans.

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