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computer help!!!!

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computer paper on tuesday. my preperation is really good but i cannot solve the logic gates question in the specimen paper of o levels 2011. plzz somebody solve the question and tell me how to solve the question for logic gates because it is bound to appear in the paper and will be a different one. time is ticking away, urgent help required =@
 
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not requires only one input and the output is always the opposite.
and will have more then one input and the out is 1 if each and every input is 1.
or will also have more than one input and output will be 1 if one or more inputs are 1.
hope this helps :)
 
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