Prove : X + X’Y = X + Y (Algebraic method)
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X Y X’ X’.Y X+X’.Y X+Y
0 0 1 0 0 0
0 1 1 1 1 1
1 0 0 0 1 1
1 1 0 0 1 1
Prove algebraically that X + X’Y = X + Y.
L.H.S. = X + X’Y
= X.1 + X’Y (X . 1 = X property of 0 and 1)
= X(1 + Y) + X’Y (1 + Y = 1 property of 0 and 1)
= X + XY + X’Y
= X + Y(X + X’)
= X + Y.1 (X + X’ =1 complementarity law)
= X + Y (Y . 1 = Y property of 0 and 1)
= R.H.S. Hence proved.
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