Which is the incorrect term in the following series?

12, 24, -2, 34, -8, 44, -18

-18

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-2

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–8

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Solution

The correct option is B
-2

The series is +12, -22, +32, -42, +52, -62, ...

$∴$ 12 + 12 = 24, 24 – 22 = 2, 2 + 32 = 34, 34 – 42 = –8, –8 + 52 = 44, 44 – 62 = –18, ...

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