In the given number sequence, how many '9's are there which are immediately…

2016

In the given number sequence, how many '9's are there which are immediately preceded by '6' but not immediately followed by '4'?

3 5 7 4 2 9 6 4 3 6 9 5 3 6 9 8 4 3 9 6 9 2 4 0 6 9 4 3 7 6 9 7 6 9 1

  1. A.

    8

  2. B.

    4

  3. C.

    5

  4. D.

    6

Attempted by 26 students.

Show answer & explanation

Correct answer: C

1. Define the required pattern: Look for the sequence `6 9 X`, where 'X' is any digit EXCEPT '4'. 2. Scan the given number sequence left to right for '69': - `6 9 5` (Valid) - `6 9 8` (Valid) - `6 9 2` (Valid) - `6 9 4` (Invalid, followed by 4) - `6 9 7` (Valid) - `6 9 1` (Valid) 3. Count the valid instances: There are exactly 5 occurrences that satisfy the condition. Final Answer: Option C

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