In a chemical laboratory some elements have high level of contamination. The probability that an element contains high level of contamination is 0.2. Four elements are randomly selected and checked for levels of contamination. What is the probability that at least one contains high level of contamination?
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This portion of Part I addresses the basic principles and methods of sampling environmental surfaces and other environmental sources for microorganisms. The applied strategies of sampling with respect to environmental infection control have been discussed in the appropriate preceding subsections.
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