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In an unclocked R-S flip flop made of NOR gates, the forbidden input condition is: 

(1) R=0, S=0 (2) R=1, S=0 (3) R=0, S=1 (4) R=1, S=1

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In an unclocked R-S flip flop made of NOR gates, the forbidden input condition is: R=1, S=1

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