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Multiple choice

Which one number is wrong in the given series? 3, 13, 31, 59, 91, 133

  1. 91

  2. 59

  3. 31

  4. 13
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series should be 1²+2=3, 3²+4=13, 5²+6=31, 7²+8=63, 9²+10=91, 11²+12=133. The term 59 breaks the pattern (should be 63). Each term follows the pattern n²+(n+1) where n=1,3,5,7,9,11.

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