Let 
evaluate X for
(a) A = 1, B = 0 C = 1
(b) A = B = C = 1 and
(c) A = B = C = 0.
(a) A=1, B=0, C=1
X = 1×1+ 0×0 + 1×0
X=1
(b) A=B=C=1
X = 1×0 + 1×0 + 1×0
X=0
(c) A=B=C=0
X = 0×1 + 0×1 + 0×1
X=0
1
Let evaluate X for
(a) A = 1, B = 0 C = 1
(b) A = B = C = 1 and
(c) A = B = C = 0.
(a) A=1, B=0, C=1
X = 1×1+ 0×0 + 1×0
X=1
(b) A=B=C=1
X = 1×0 + 1×0 + 1×0
X=0
(c) A=B=C=0
X = 0×1 + 0×1 + 0×1
X=0