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I'm using a TI84 calculator. Multiple-choice questions each have 5 possible answers, one of which is correct.

I need some help with the formula for this. I'm using a TI84 calculator.


Multiple-choice questions each have 5 possible answers, one of which is correct. Assume that you guess the answers to 4 such questions.


Use the multiplication rule to find the probability that the first three guesses are wrong and the fourth is correct. That is, find P(WWWC)

where C denotes a correct answer and W denotes a wrong answer. 

(round answer to 4 decimal places) 

P(WWWC)=


What is the probability of getting exactly one correct answer when 4 guesses are made? 

(round answer to 4 decimal places)

P=

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