Direction: Select the one which is different from the others.
Question and options
Direction: Select the one which is different from the others.
- 621
- 1090
- 962
- 842
Answer and explanation
Correct answer: A - 621
842 = 29^2 + 1, 962 = 31^2 + 1 and 1090 = 33^2 + 1 (squares of consecutive odd numbers plus 1), whereas 621 is not of this form (25^2 = 625) and is also the only odd number. So 621 is the odd one out.
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CUSAT CAT Integrated IPR Ph.D.
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