To solve the subtraction problem 11001 – 1111, we can use binary subtraction. Here’s how you can perform the subtraction:

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11001
- 1111
---------


Starting from the rightmost digit (the ones place) and moving to the left:

1. 1 – 1 = 0
2. 0 – 1 (borrowing 1 from the next column) = 1 (write down 1)
3. 1 (from the borrow) – 1 = 0
4. 0 – 1 (borrowing 1 again) = 1 (write down 1)
5. 1 (from the borrow) – 1 = 0

So, the result of 11001 – 1111 in binary is 10010.