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Question:

Truth table for the given circuit will be ABCD?

Solution:

xy⁻⁻⁻xa=x.yb=⁻⁻⁻x.yz=⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻a.b
0 0 1 0 0 1
0 1 1 0 1 1
1 0 0 0 0 1
1 1 0 1 0 1