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How many pairs of digits are in the number 83573971, each of which have as many digits between them, both in the forward and backward directions, as they have between them according to the English numeric series?

1. One
2. Four
3. Three
4. Two

Correct answer: Three

Solution

A valid pair must have the same number of digits between them in the number as the difference in their positions in the English numeric series. In 83573971, three such pairs satisfy this condition. Therefore, the correct answer is Three.

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