Read Chapter 4 and classnotes and answer the following questions:.

#55, 56, 57, 59, 62

Verify DeMorgan's Law using truth table: ( A ＋ B ＋ C)′ = A′ ● B′ ● C′

Is A ● B ＋ A ● B′ + A ● B ● A′ = A true? Explain. (Hint: use Boolean algebra properties where●means AND operation, for＋for OR operation, and′for NOT operation.