Posted by **Zach** on Thursday, November 12, 2009 at 9:25pm.

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 -
**Reiny**, Thursday, November 12, 2009 at 9:33pm
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 -
**Zach**, Thursday, November 12, 2009 at 9:36pm
Thanks

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

:)

- Algebra 1 -
**Reiny**, Thursday, November 12, 2009 at 10:07pm
welcome!

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