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In Number sequece questions, you are given a long series of numbers. It is required to find out how many times a number satisfying conditions, specified in the questions, occurs.

In the series,
6  4  1  2  2  8  7  4  2  1  5  3  8  6  2  1  7  1  4  1  3  2  8  6
How many pairs of alternate numbers have a difference of 2 ?

Option:
A. One
B. Two
C. Three
D. Four
Answer: B . Two

Justification:

We proceed by checking the difference between pairs of alternate numbers i.e., (6,1), (4,2), (1,2), (2,8), (2,7), (8,4), (7,2) (4,1), (2,5), (1,3), (5,8), (3,6), (8,2), (6,1), (2,7), (1,1), (7,4), (1,1), (4,3), (1,2), (3,8), and (2, 6). Of these, the pairs with a difference of 2 are (4,2) and (1,3). Clearly, there are two such pairs.

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