JIPMAT 2021 (LR) - In this question, a number series is given with one term missing. Choose the correct option that will continue the same pattern. 17, 19, 15, 23, 7, 39, ? | PYQs + Solutions | AfterBoards
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JIPMAT 2021

Logical Reasoning
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Logical Sequence

Easy

In this question, a number series is given with one term missing. Choose the correct option that will continue the same pattern.
17, 19, 15, 23, 7, 39, ?

Correct Option: 2
Let's look at consecutive differences:\newline 17,19,15,23,7,39,?17, 19, 15, 23, 7, 39, ?\newline \newline +2,−4,+8,−16,+32+2, -4, +8, -16, +32
The pattern:\newline Each difference alternates between ++ and −-\newline The absolute value doubles each time: 2,4,8,16,322, 4, 8, 16, 32
Therefore:\newline Next number should subtract 6464 from 3939\newline 39−64=−2539 - 64 = -25

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