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Algebra

Blazing goIITian

Joined:	29 Sep 2007
Post:	487

22 Nov 2007 18:08:51 IST

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463

test ur logic

Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Algebra

in answering a question on a multiple choice test a person either knows the answer or guesses.let 3/4 be the probability that he knows the answer and 1/4 be the probability that he guesses.assuming that a a student who guesses will be correct with probability 1/4 what is the probability that the student knows the answer , given that he has answered it correctly?

conditions : u are not allowed to use bayes' theorem

u are allowed to use only the basic probability formula

P=no. of favourable outcomes/sample space

Comments (5)

NITESH BASKARAN

Blazing goIITian

Joined: 29 Sep 2007

Posts: 487

22 Nov 2007 19:27:02 IST

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come on goiitians take a go at this .its a good one ,trust me.
person who answers this before 6pm tomorrow gets two hats

Learner .

Blazing goIITian

Joined: 5 Nov 2007

Posts: 507

22 Nov 2007 20:43:58 IST

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Buddy you can use fav.outcomes/tot. outcomes only when each event is equally likely to occur,right?Here I dont think thats the case..

Ananth Patri

Blazing goIITian

Joined: 15 Dec 2006

Posts: 1325

22 Nov 2007 20:52:46 IST

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is the answer 3/4 + 1/16 =13/16 ????

Ananth Patri

Blazing goIITian

Joined: 15 Dec 2006

Posts: 1325

22 Nov 2007 20:57:56 IST

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plz reply,,,,,,,,,,,,,,,,,,,,

NITESH BASKARAN

Blazing goIITian

Joined: 29 Sep 2007

Posts: 487

22 Nov 2007 20:58:12 IST

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@learner
yep u can -just think
@ananth
nope that isnt the answer
anyway how did u work that out

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