Computer Science · May / June 2016 · Paper 12 · Question 7
2210
As printed in the paper
Show the answer and mark scheme
7(a)[4]
A B C Working space X 0 0 0 0 0 0 1 1 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 1 1 1 0 1 1 1 1 0 4 marks for 8 correct X bits 3 marks for 6 correct X bits 2 marks for 4 correct X bits 1 mark for 2 correct X bits [4]
7(b)[5]
1 mark for each correct gate with correct source of input [5]
7(c)[4]
Each dotted area is 1 mark [4]
A B C X A C B X
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