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

Choose the missing terms out of the given alternatives : DEF , HIJ , MNO , ?

125, 80, 45, 20, ?

One term in the number series is wrong. Find out the wrong term.<br> 1, 3, 10, 21, 64, 129, 356, 777

1, 5, 13,25,41,?

Choose the missing terms out of the given alternatives.<br> Z, ?, T, ?, N, ?, H, ?, B

4, 7, 12, 19, 28, ?

In the series 2, 6, 18, 54, ...... what will be the 8th term ?

Choose the missing terms out of the given alternatives : 2A11, 4D13, 12G17, ?