In the series,

6 4 1 2 2 8 7 4 2 1 5 3 8 6 2 1 7 1 4 3 1 2 8 6

How many pairs of successive numbers have a difference of 2 each?

What should come in the place of the question mark (?) in the following alphanumeric series ? A1X, B4P, E25J, J100F, ?

Find the missing term in the series:

B12D, G32I, L52N, ?, V92X

A series of letters and numbers is given, the terms of which follow certain definite pattern in groups. However, some terms in the series are missing. Choose the correct sequence from the options.

Z 24 _ Y _ B _ 18 C W 15 _

(A) X

(B) D

(C) 21

(D) A

Choose the correct answer from the options given below:

In the given question, find the next term in the alpha-numeric series?

Z1A, X2D, V6G, T21J, ...?..., P445P

Fill up the gap with proper group of alphabets.

I K M J L N K M O ?

Select the letter that can replace the question mark (?) in the following series.

A, E, I, ?, Q, U