Simplify the Boolean expression, Computer Engineering

The Boolean expression A‾.B + A.B‾ + A.B is equivalent to ?

Ans. The Boolean expression A‾ .B + A. B‾+ A.B is equivalent to A + B

(A‾ .B + A. B‾+ A.B = B( A‾ + A) + A. B‾
= B + A. B‾ {Q ( A‾ + A) = 1}
= A + B {Q (B + A.B‾) = B + A}

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