A series is given with one term missing. Choose the correct option from the given alternatives and complete the series.
3, 2, 6, 8, 18, 40, 72, 240, ?

Select the combination of letters that when  sequentially placed in the gaps of the given letter series will complete the series .
gfe_ig_eii_fei_gf_ii

In the following question, select the missing number from the given series.
111, 222, 444, ?, 1776, 3552

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
EFGHI, LMNO, RST, WX?

Which of the following numbers will replace the question mark (?) in the given series?
 286, 303, 320, 371, 422, 507,?

Select the letter that can replace the question mark (?) in the following series.
X, U, P, M, ?, E

In the following question, select the missing number from the given series.
2, 5, 12, 27, ?

Which of the following numbers will replace the question mark (?) in the given series?
 19, 38, 35, ?, 135, 810