In the given number 1 2 3 4 5 6 7 8 9 1, we interchange the first and the second digits, the third and the fourth digits and so on. Then which digit will be sixth from the right?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 6
The digits are swapped in pairs from the left: 1st with 2nd, 3rd with 4th, and so on, so the ten digits form five pairs.
Pairs: (1 2) (3 4) (5 6) (7 8) (9 1)
After the swaps: (2 1) (4 3) (6 5) (8 7) (1 9), that is, 2 1 4 3 6 5 8 7 1 9
Counting from the right: 9 (1st), 1 (2nd), 7 (3rd), 8 (4th), 5 (5th), 6 (6th)