In the number sequence '4 7 8 4 6 5 1 2 3 5 4 7', if all the odd numbers are increased by one and all the even numbers are decreased by two, and the new digits are then arranged in ascending order, which digit will be the eighth from the right?

Two sets of numbers are given below. In each set, certain mathematical operation(s) on the first number result in the second number, and on the second number result in the third number, and so on. Which of the given options follows the same set of operations? (NOTE: Operations should be performed on whole numbers without breaking down digits.) Set 1: 5 - 12 - 25 - 18 Set 2: 9 - 16 - 33 - 26

If 2 is added to each odd digit and 2 is subtracted from each even digit in the number 7586134, what will be the sum of the third digit from the left and the third digit from the right in the new number thus formed?