The position of how many digits in the number 315468792 will remain unchanged after the digits are rearranged in the ascending order within the number.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Two
Write the digits in ascending order under the given number and compare them place by place; a digit keeps its position only where the two rows agree.
Given number: 3 1 5 4 6 8 7 9 2
Ascending order: 1 2 3 4 5 6 7 8 9
The rows agree only in the 4th place (4) and the 7th place (7), so two digits stay where they are