Page 736 - SUBSEC October 2017_Neat

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02238020/CAPE SPEC/MS/2017

Question 2 KC UK XS

A B Sum Carry 2
(ii)
0 0 0 0
0 1 1 0

1 0 1 0
1 1 0 1
1 mark for Sum column, 1 mark for Carry column

When the result of binary addition produces a sum that cannot
be accommodated by one column, the carry is necessary to
report the result (1).

The Ex OR Gate produces the sum and the AND Gate produces the
carry.

P Q R S
I1 I2 I3
A 1 0 1 1 0 0 1

B 1 1 1 0 1 1 1

10 15 5

Total 30 marks