Choose the correct order of the given alternative : AFI, JOR, MRU, ?

One term in the number series is wrong. Find out the wrong term.<br> 10, 26, 74, 218, 654, 1946, 5834

Choose the missing terms out of the given alternatives.<br> WFB, TGD, QHG, ?

One term in the number series is wrong. Find out the wrong term.<br> 1, 5, 9, 15, 25, 37, 49

1, 5, 14, 30, 55, 91, ?

Choose the missing terms out of the given alternatives : 2B, 4C, 8E, 14H, ?

Consider the following series:<br>A B C D .... X Y Z | Y X ...... B A | B C D ...... Y Z | Y X ..... C B A | B C .…

Which term of the series 5, 10, 20, 40, ..... is 1280?

One term in the number series is wrong. Find out the wrong term.<br> 3, 2, 8, 9, 13, 22, 18, 32, 23, 42