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If a² + b² = 25 and a + b = 7 then ab equals?
  1. 11
  2. 12
  3. 13
  4. None of these
Explanation

Use (a + b)² = a² + 2ab + b²  

7² = 25 + 2ab  

49 = 25 + 2ab  

2ab = 49 - 25 = 24  

ab = 12  


Last verified on 07-05-2026

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