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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 a school, the following codes were used during physical exercise. '1' means 'start walking', '2' means 'keep standing', '3' means 'start running at the same spot', '4' means 'sit down'.
How many times will a student who performs the following sequence without error from the beginning to the end have to sit down ?
1  2  3  4  2  3  1  4  4  3  2  2  1  2  4  3  1  4  4  1  2

Option:
A. 2
B. 3
C. 4
D. 5
E. None of these
Answer: C . 4

Justification:

Clearly, the student will have ti sit down at the places marked by boxes :
1  2  3  4  2  3  1  4  4  3  2  2  1  2  4  3  1  4  4  1  2

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