Question 12

How many such 5s are there in the following sequence that the sum of the two immediately following digits is greater than the sum of the two immediately preceding digits ?
3 7 6 5 8 3 2 4 5 5 4 8 7 9 1 5 3 4 8 7 5 9 8 7 6 4

Solution

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Given sequence 3 7 6 5 8 3 2 4 5 5 4 8 7 9 1 5 3 4 8 7 5 9 8 7 6 4
5's for which the sum of following two digits is greater than the sum of preceding two digits are highlighted below
3 7 6 5 8 3 2 4 5 5 4 8 7 9 1 5 3 4 8 7 5 9 8 7 6 4, Thus there are 3 such 5's so option 3

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