Computer Science · Oct / Nov 2020 · Paper 11 · Question 4
0478
As printed in the paper
The question as text
Consider the given logic statement: X = ((NOT (A NAND B)) OR (B NOR C))
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
4(a)[4]
One mark for each correct gate with correct input
4(b)[4]
Four marks for 8 correct outputs
Three marks for 6/7 correct outputs
Two marks for 4/5 correct outputs
One mark for 2/3 correct outputs
Working space
A
B
C
X
0
0
0
1
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
1
1
0
1
0
1
1
0
1
1
1
1
1
4(c)[4]
One mark for the correct gate and one mark for the correct truth table
ANDA
B
X
0
0
0
0
1
0
1
0
0
1
1
1
XORA
B
X
0
0
0
0
1
1
1
0
1
1
1
0
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