Twos complement arithmetic If I have the expression:

 1011 0000 1110
-1000 1110 0001
----------------


Then, I find the twos complement of the second number: 

 0111 0001 1110
+0000 0000 0001
---------------
 0111 0000 1111


I then add this to the first number:

 1011 0000 1110
+0111 0000 1111
---------------
 0010 0001 1101


But the answer given is:

 0010 0001 1100


Can anybody see my error?
The given answer can't be correct: Just from the last digits it claims that the result of subtracting an odd number from an even number is even.

However, you also made a mistake in your calculation: The 2's complement should be 0111 0001 1111.