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Guessing answers on a test 
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#1
Sep2110, 04:26 PM

P: 8

I've been struggling with this problem for two days. It is out of the Concepts in Probability and Stochastic Modelling textbook (1.413), and it goes like this:
[tex] ({\frac{2}{3}})^7 [/tex]. The sample space doesn't change as he goes about guessing the answers, so neither combinations nor permutations apply here, it seems. But then, when he fills out the remaining 8 true answers, he's no longer randomly picking answers but just marking those remaining 8 answers as false. I am probably overthinking the problem, but at this point I'm stuck. Would greatly appreciate any help. EDIT: crap. Didn't realize I'm not supposed to post in this forum. Apologies. Reposting in the coursework forum. 


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