(ii) The dual of (X'+ 1 ).(Y' + 0) = Y'
(a) X.0 + Y.1 = Y
(b) X'.1 + Y'.0 = Y'
(c) X'.0 + Y'.1 = Y'
(d) (X'+ 0) . (Y'+ 1) = Y'

Solution

In dual we change
0 → 1
1 → 0
. → +
+ → .
= (X' + 1).(Y' + 0) = Y'
= X'.0 + Y'.1 = Y'
Option (c) is correct.