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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