How accurate are the answers on tutor-work

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How accurate are the answers on tutor-work? For example either factor A or B can cause a certain disease, but only when followed by exposure to factor Z. Exposure to factor Z alone is not followed by the disease, but the disease never occurs in the absence of exposure to factor Z, Factor Z is: i think the answer should be, necessary but not sufficient but the answer from tutor- work is necessary and sufficient. which answer is correct?

Reference no: EM131543027

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