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Which of the following is the odd number from the given alternative?

Question and options

Which of the following is the odd number from the given alternative?
  1. 1090
  2. 962
  3. 626
  4. 841

Answer and explanation

Correct answer: D - 841
1090=332+11090 = 33^2 + 1, 962=312+1962 = 31^2 + 1 and 626=252+1626 = 25^2 + 1 are each one more than a square. 841=292841 = 29^2 is itself a perfect square, so it is the odd one.

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