Given ten digit number is 6438123953
First half of the digits are : 64381
These are rearranged in descending order, so it becomes, 86431
Second half of the digits are : 23953
These are rearranged in ascending order, so it becomes, 23359
The new number is 8643123359
Comparing the new number with the given number
|
6 |
4 |
3 |
8 |
1 |
2 |
3 |
9 |
5 |
3 |
|
8 |
6 |
4 |
3 |
1 |
2 |
3 |
3 |
5 |
9 |
We see that, 4 digits position (highlighted) remains unchanged
Hence ‘4’ is the correct answer.





