Verbal Reasoning - Mental Ability Questions

Find the odd word/letters/number from the given alternatives.

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
6, 18, 54, ? , 486, 1458

Two airliners start from the same airport. A flies 20 km South. B flies 35 km East, then turns South and flies 45 km, then turns to its right and flies 35 km. Where is B with respect to A now?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. PR, VX, BD, ?

Select the Missing number?

In the following question, select the related letter pair from the given alternatives.PIR : OHQ : : ? : ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.HPA, FMZ, DJY, BGX, ?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

a_ ca_c_dc_d_ad_