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If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 8731542, what will be the difference between the highest a
Question

If 1 is added to each odd digit and 1 is subtracted from each even digit in the number 8731542, what will be the difference between the highest and lowest digits in the number thus formed?​

A.

6

B.

4

C.

5

D.

7

Correct option is D

Given: 8731542
Add 1 to each odd digit and subtract 1 from each even digit.
8 → even → 8 − 1 = 7
7 → odd → 7 + 1 = 8
3 → odd → 3 + 1 = 4
1 → odd → 1 + 1 = 2
5 → odd → 5 + 1 = 6
4 → even → 4 − 1 = 3
2 → even → 2 − 1 = 1
New digits: 7, 8, 4, 2, 6, 3, 1
Highest = 8
Lowest = 1
Difference:
= 8 − 1
= 7
So, will be the difference between the highest and lowest digits in the number thus formed.
Thus, correct option is (d).

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