How many 6s are there in the following number series, each of which is immediately preceded by 1 or 5 and immediately followed by 3 or 9? 2 6 3 7 5 6 4 2 9 6 1 3 4 1 6 3 9 1 5 6 9 2 3 1 6 5 4 3 2 1 9 6 7 1 6 3
A
None
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B
One
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C
Two
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D
Three
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Solution
The correct option is D Three 2 6 3 7 5 6 4 2 9 6 1 3 4 1 6 3 9 1 5 6 9 2 3 1 6 5 4 3 2 1 9 6 7 1 6 3 In the given series, there are 3 such 6s that are immediately preceded by 1 or 5 and immediately followed by 3 or 9 as marked in Bold. Answer is Option D