If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 7125843, then what will the sum of the highest and lowest digits in the new number thus formed be?​

Given: 7125843

Add 1 to each odd digit and subtract 2 from each even digit.

7 is odd → 7 + 1 = 8

1 is odd → 1 + 1 = 2

2 is even → 2 - 2 = 0

5 is odd → 5 + 1 = 6

8 is even → 8 - 2 = 6

4 is even → 4 - 2 = 2

3 is odd → 3 + 1 = 4

The new number formed is: 8, 2, 0, 6, 6, 2, 4

Highest = 8

Lowest = 0

Sum of highest and lowest = 8 + 0 = 8

So, 8 will the sum of the highest and lowest digits in the new number thus formed be.

Thus, correct option is (d).