Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following is/are not equal to 1 in Boolean algebra? (1) \[A+1\] (2) \[A\,.\,\overline{A}\] (3) \[A+\overline{A}\] (4) \[\overline{A+\overline{A}}\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
From Boolean Algebra \[A+1=1\] \[A+{{A}^{-1}}=1\] \[A.{{A}^{-1}}=0\] \[\overline{A+\overline{A}}=\overline{A}.\overline{A}\] \[=\overline{A}.A\] \[=0\] Hence, option is correct.
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