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Question
Show that \[AB + \overline {AB }\] is always 1.
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Solution
Given:
AB = y
∴ \[X = y + \overline{y}\]
X = 0 + 1
= 1
For y = 1,
X = 1 + 0
= 1
Thus, X = 1 for all values of y = AB.
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