Answer:
0011
Explanation:
1000 - 101
first step is to convert the binary numbers to decimal to perform the required operation of subtraction:
8 4 2 1
1 0 0 0
-
1 0 1
_________
0 0 1 1
thus,
1000 in decimal = 8
101 in decimal = 5
8 - 5 = 3 which is equivalent to 0011