# Algebra 1

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On a multiple choice test with 10 questions and 5 choices, A,B,C,D,E, for each questions, what are the odds of guessing on all 10 questions and getting 100%. State your answer as a common fraction.
Thanks
-Zach

• Algebra 1 -

the prob of getting all 5 correct is
(1/10)*(1/10)*(1/10)*(1/10)*(1/10)
= (1/10)^5 or
= 1/100,000
so the prob of NOT getting all 5 correct
= 1 - 1/100,000 = 99999/100,000

so the odds in favour of getting all 5 correct is
1 : 99,999

• Algebra 1 -

Thanks
And I think you answered my question last time i posted, so thanks for keep on rollin'
:)

• Algebra 1 -

welcome!

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