The position of the first and the sixth digits in the number 7398604215 are interchanged. Similarly the second and the seventh digits are interchanged and so on. Which of the following will be the fifth from the right end after the re-arrangement?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 7
The number has 10 digits, so the swaps pair each digit of the first half with the digit five places after it: 1st with 6th, 2nd with 7th, 3rd with 8th, 4th with 9th and 5th with 10th. In effect the two halves change places.
The number: 73986 | 04215
After the swaps: 04215 | 73986, that is, 0421573986
Fifth from the right end is the 6th digit from the left (\(10-5+1=6\)), which is 7