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Fundamental Principle of Counting

How many 9's ...

Question

How many 9's are there which come after 6 or multiple of 3 ? 6 9 9 9 6 9 7 9 6 9 7 9 5 9 2 9 8 9 6 9 6 9 9 9 9 7 9 8 9 6 9 7 8

A

7

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B

9

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C

11

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D

6

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Solution

The correct option is C 11
Following pattern satisfies the condition

69
99
99
69
69
69
69
99
99
99
69

Count is 11. Hence, correct answer is (C).

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