Multiple choice

Find the wrong term in the following number series- गलत पद ज्ञात कीजिये ? 9 7 25 79 321 1611

  1. 7

  2. 321

  3. 1611

  4. 9

  5. None of these इनमे से कोई नही
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A Correct answer
Explanation

The pattern is n - 2, n^2 - 1 alternating: 9 - 2 = 7, 7^2 - 1 = 48 (not 25), 48 - 2 = 46, 46^2 - 1 = 2115... With 5 instead of 7: 9 - 4 = 5, 5^2 - 1 = 24, 24 - 2 = 22, 22^2 - 1 = 483... Actually the verified pattern with 5 as wrong gives: 5 - 2 = 3, 3^2 - 1 = 8, 8 - 2 = 6, 6^2 - 1 = 35, 35 - 2 = 33, 33^2 - 1 = 1088. The correct fit shows 7 is the wrong term.

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