What will come in the place of lsquo rsquo in the following number series 29 21 42 21 84 ........

Quantitative Aptitude(IBPS RRB PO) Number series

What will come in the place of ‘?’ in the following number series. 29, 21, -42, 21, -84, ?

This questions was previously asked in

RRB PO Prelims (06 Aug, 2023 Shift 1)

-112

112

-147

147

-184

Correct option is 3. -147

Logic used is

29x0+21x1=21

21x1-21x3=-42

- 42x2+21x5=21

21x3-21x7= - 84

-84x4+21x9= -147

Therefore next number in the series -147.

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