How many such pairs of digits are there in the number 857169224, each of which has as many digits between them in the number, in both forward and backward directions, as they have between them in the natural number series?

One
Two
Three
Four

Correct answer: Four

Solution

We need pairs of digits whose numerical difference equals the number of digits between them. In 857169224, the qualifying pairs are (8,5), (5,7), (7,6), and (6,9) when checked by position and digit gap. Hence, there are four such pairs.

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