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SSC CHSL 2020 · PYQ · Algebra · medium

If a + b = 11 and ab = 15, then a² + b² is equal to:

  1. A.91✓ Correct
  2. B.90
  3. C.92
  4. D.93

Explanation

a²+b² = (a+b)²−2ab = 11²−2×15 = 121−30 = 91.
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