If 2 is added to each even digit and 1 is subtracted from each odd digit in the number 4123957, what will be the difference between the greatest and smallest digits in the new number thus formed?​

Given: 4123957

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

4 is even → 4 + 2 = 6

1 is odd → 1 − 1 = 0

2 is even → 2 + 2 = 4

3 is odd → 3 − 1 = 2

9 is odd → 9 − 1 = 8

5 is odd → 5 − 1 = 4

7 is odd → 7 − 1 = 6

New number formed: 6042486

Greatest digit = 8

Smallest digit = 0

Difference: 8 − 0 = 8

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

Thus, correct option is (d).