Computer Science · Oct / Nov 2024 · Paper 22 · Question 9
0478
As printed in the paper
The question as text
Consider the logic expression: X = (NOT P OR Q) NAND (Q XOR R)
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
9(a)[4]
One mark for each correct gate, with the correct input(s) as shown. P
Q X R
9(b)[4]
Four marks for eight correct outputs
Three marks for six or seven correct outputs
Two marks for four or five correct outputs
One mark for two or three correct outputs
P
Q
R
X
0
0
0
1
0
0
1
0
0
1
0
0
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
0
1
1
1
1
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