Computer Science · May / June 2026 · Paper 21 · Question 8
0478
As printed in the paper
The question as text
Consider the logic circuit: A B X C
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
8(a)[3]
One mark for each mark point:
A XOR BB AND NOT Ccorrect expression: X = (A XOR B) OR (B AND NOT C) // X = A XOR B OR B AND NOT C8(b)[4]
A
B
C
X
0
0
0
0
0
0
1
0
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
0
4 marks for 8 correct outputs
3 marks for 6/7 correct outputs
2 marks for 4/5 correct outputs
1 mark for 2/3 correct outputs
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