RRB PO 2018 Pre Memory Based Questions

Find Wrong no in the series

1.2,7,27,107,427,1708,6822
2.750,535,411,348,322,314,315
3.1,15,119,475,949,947,473
4.1,3,7,15,31,64,127
5.250,260,291,314,640,370,314

Ans
1. 1708-->  1707 ,logic -->(x4-1)
2.314-->315  logic-->(216-1 125-1 64-1 27-1)
3.947-->948 logic--> (x16-1 x8-1 x2-1 x1-1)
4.64-->63   logic-->(x2+1)
5. 270-->271 logic--> Difference 21 22 23 26 30 35

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