10001two
11001two
110001two
11010two
10001two
Correct answer is D
Convert each value to decimal (base 10)
1011two → 11
+ 1101two → 13
+ 1001two → 9
- 111two → 7
: 11 + 13 + 9 - 7 = 26
26 → 11010two
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