Question 111

How many 7’s are there in the number series which are followed by 2 or 3 or 4 or 5?
73727475757207072737475767778747273747576777879777273

Solution

We need to find 7's which are followed by 2 or 3 or 4 or 5, i.e. We need to find pairs of 72 or 73 or 74 or 75.

73 72 74 75 75 72 07072 73 74 75 76777874 72 73 74 75 767778797772 73

There are 17 such pairs.

=> Ans - (D)

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