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Suppose a recent survey of chicken meat resulted in the following test results: 81% were contaminated with campylobacter, 15% were contaminated with salmonella, and 13% were contaminated with both of these bacteria. What is the probability that a tested chicken chosen at random is:

a. contaminated with salmonella and not campylobacter
b. contaminated with salmonella or compylobacter
c. contaminated with salmonella or campylobacter but not both
d. not contaminated with either salmonella or campylobacter

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