Multiple choice general knowledge math & puzzles

The position of the first and the sixth digits in number 5314278906 are interchanged. Similarly the position of the second and the saventh digits are interchanged and so on. Which of the following will be the fourth from the right end after the rearrangemenr?

  1. 3

  2. 1

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The number 5314278906 has 10 digits. After swapping positions 1↔6, 2↔7, 3↔8, 4↔9, 5↔10, we get: 7 (pos 1), 8 (pos 2), 9 (pos 3), 0 (pos 4), 2 (pos 5), 5 (pos 6), 3 (pos 7), 1 (pos 8), 4 (pos 9), 6 (pos 10). The new number is 7890253146. Fourth from right is 3.

AI explanation

Swapping the 1st digit with the 6th, the 2nd with the 7th, and so on across 5314278906 produces the new sequence 7896531342 (working through each swapped pair in turn). Counting from the right end of this new number, the fourth digit in is 3, which is why that's the correct choice.

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