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How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

  • A.None
  • B.One
  • C.Two
  • D.Three

Answer: D

Correct answer: Three

Writing 421579368 in ascending order gives 123456789, and comparing the two, three pairs of digits keep the same number of digits between them in both arrangements. So the answer is three.

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