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The positions of how many digits

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The positions of how many digits in the numbers $837912$ will remain unchanged after the digits within the number are rearranged in descending order? (from left to right)

 

  1. None
  2. One
  3. Two
  4. Three
  5. More than three

 

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$7$ is unchanged

ans : one
anonymous • edited by
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Original Number                Descending Order

837912                                  9 8 7 3 2 1

only 1 digit in the numbers 837912 will remain unchanged.

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