Question 112

How many 7’s are there such that each has a 7 preceeding it and 7 following it?
73727475757207072737475767778747273747576777879777273

Solution

We need to find 7's which has a 7 preceding and following it, i.e. we need to find triplet of 7s

73727475757207072737475767778747273747576777879777273

Thus, there are 3 such triplets.

=> Ans - (A)

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