JIPMAT 2021 (QA) - The odd term out in the series 15, 16, 34, 105, 424, 2124, 12756 is | PYQs + Solutions | AfterBoards
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JIPMAT 2021

Logical Reasoning
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Logical Sequence

Easy

The odd term out in the series 15, 16, 34, 105, 424, 2124, 12756 is

Correct Option: 3
The series goes like this =(the number×n)+n=(\text{the number}\times n)+n \newline to give the next number, where nn is consecutive first natural numbers.
(15×1)+1=16(15\times1)+1=16
(16×2)+2=34(16\times2)+2=34
(34×3)+3=105(34\times3)+3=105
(105×4)+4=424(105\times4)+4=424
(424×5)+5=2125(424\times5)+5=2125
Hence, 21242124 is the odd term out in the above series.

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