Hi

a test consists of 5 multiple questions, the questions have 5 answers. 

Only 1 answer is correct for each question. 

P(correct) = .20 P(incorrect) = .80

how many different ways can the test be answered? 5^5

P(probability they only get the first 'and' last question correct)

P(2 correct out of 5) =  10(.2)^2(.8)^3 

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