A) $ X=\overline{\overline{A}}\cdot \overline{\overline{B}} $
B) $ X=\overline{A\cdot B} $
C) $ X=A\cdot B $
D) $ X=\overline{A+B} $
सही उत्तर: C
$ X=\overline{\overline{AB}}=A\cdot B $ (अर्थात् AND गेट)
यदि दिए गए चित्र में NAND गेट का आउटपुट X, NOT गेट (जो NAND गेट से दोनों इनपुट्स को जोड़कर बनाया गया है) के इनपुट से जुड़ा हो तो हमें वापस एक AND गेट प्राप्त होता है।
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