The series given below contains a sequence of numbers. Identify the incorrect combination.
1, 8, 3, 6, 5, 4, 6

What will be the next number in the given series?
  3, 28, 4, 65, 5,126,6,.........?

The average of 25 results is 18. The average of first twelve of them is 14 and that of last twelve is 17. Find the thirteenth result -

Select the option that will fill in the blank and complete the given series.
0 , 7, 26, 63,124, 215, 342, 511, 728,___

In the following question , a series is given with one terms missing . Choose the correct alternative from the given ones that will complete the series :

21 , 26 , 33 , 42 , 53 , ? 

In each of the following, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
5, 30, 155, 780, ?