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If A = x² − y², B = 20 and x + y = 10, then

  1. (a)A is greater than B
  2. (b)B is greater than A
  3. (c)A is equal to B
  4. (d)It is not possible to compare A and B as the data provided is inadequate
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Official answer(d) It is not possible to compare A and B as the data provided is inadequate