If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 1862547, then what will the difference between the highest and lowest digits in the new number thus formed be?​

Given: 1862547

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

1 (odd) → 1 + 1 = 2

8 (even) → 8 − 2 = 6

6 (even) → 6 − 2 = 4

2 (even) → 2 − 2 = 0

5 (odd) → 5 + 1 = 6

4 (even) → 4 − 2 = 2

7 (odd) → 7 + 1 = 8

New number: 2, 6, 4, 0, 6, 2, 8

Highest = 8

Lowest = 0

Difference = 8 − 0 = 8

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

Thus, correct option is (b).