Each of the digits in the number 789245361 is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?
None
Write the original number digit by digit: 7, 8, 9, 2, 4, 5, 3, 6, 1.
Arranging the same digits in ascending order from left to right gives 1, 2, 3, 4, 5, 6, 7, 8, 9.
Comparing position by position: 7↔1, 8↔2, 9↔3, 2↔4, 4↔5, 5↔6, 3↔7, 6↔8, 1↔9. None of the nine positions contain the same digit before and after rearrangement.
Hence, the correct answer is None.
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