Question

If in the number 546839271, 1 is added to first, third, fifth, seventh and ninth digit and 1 is subtracted from the second, fourth, sixth and eighth digits, then all digits are arranged in descending order from left to right. Which of the following digit is 4th from the right end?

• A. 7
• B. 6
• C. 3
• D. 4
• E. 5

Hint:

To avoid confusion with positions, write the numbers 1-9 directly above the digits before starting. When sorting in descending order, the "4th from the right" in a 9-digit set is also the "6th from the left."

Answer 1

Answer: (E)