How many pairs of digits are there in the number 6315784 each of which has as many digits between them in the number as when the digits are rearranged in descending order?
When the digits are arranged in descending order the number becomes 8765431.
There are two pairs (7,8) and (3,5) that has as many digits between them in the number as when the digits are rearranged in descending order.
Hence, the correct answer is two.
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