11.
The cumulative addition of the four binary bits ( 1 + 1 + 1 + 1) gives
Answer: B
Correct answer: 100
\(1+1+1+1 = 4\), and four in binary is 100. The other options are not equal to four: 111 is 7, 1111 is 15 and 1001 is 9.
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