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If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 8146752, what will be the difference between the last and
Question

If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 8146752, what will be the difference between the last and first digits from the left in the new number thus formed?

A.

3

B.

4

C.

6

D.

5

Correct option is C

Given: 8146752.
Add 1 to each odd digit and subtract 1 from each even digit.
8 is even → 8 − 1 = 7
1 is odd → 1 + 1 = 2
4 is even → 4 − 1 = 3
6 is even → 6 − 1 = 5
7 is odd → 7 + 1 = 8
5 is odd → 5 + 1 = 6
2 is even → 2 − 1 = 1
The new number formed: 7235861
The first digit = 7
The last digit = 1
Difference: 7 − 1 = 6
So, 6 will be the difference between the last and first digits from the left in the new number thus formed.
Thus, correct option is (c).

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