In how many ways can letter of the word MAILINGS arrange so that M and N always come together? 

In this question, a sequence is given, with one term missing. Choose the correct option from the given options.
10 , 18 , 28 , 40 , ? 

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

15       50          155        470        1415       ____ ?

What should come at place of question mark (?) in the following number series?

1.7 5.4 19.2 80.8 409 ?

Which number will replace the question mark(?) in the following number series?
7, 11, 18, 29, ? , 76

Directions: Find the wrong number in the following number series:

2, 6, 10, 19, 36, 69, 134

In a row of 21 men when Manish was shifted by four places towards the right, now he becomes 12th from the left end. What was his earlier position from the right end of the row? 

Which of the following n umbers will replace the question mark (?) in the given series?
 78, 112, 64, ?, 50, 140