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# Boolean Algebra – 1

1. In a digital control system, there are three inputs a,b,c. The output should be present when at least two inputs are present.
The Boolean expression for the output is :

(a) $\dpi{100} ab+bc+ac$
(b) $\dpi{100} abc+ab\bar{c}+\bar{a}bc+a\bar{b}c$
(c) $\dpi{100} b\bar{c}+a\bar{b}c+\bar{a}bc$
(d) $\dpi{100} a\bar{b}+b\bar{c}+\bar{a}c$