IIT JEE , AIEEE Forum - Mathematics , Algebra - Probability problem-Plzzz help

ramyadiamond

Plz help me with this;

Each of 10 urns contain 5 white and 7 black balls. One ball is transferred from the first urn to the second and then one ball is transferred from the second to the third and so on. Finally one ball is taken out from the 10th urn. The probability that this ball is white is?

Thanks in advance!

priyatamau

here i think u must use the condition which is meant
here am i corree ct or not pls refer me freinds

ramyadiamond

somebody plzz help me with this problem

shakirshafi12

ramya we will have to make many cases for this question
cases 1 from 1st urn we take out white or black and put in urn 2
p(white is being put in urn 2)=5/12
p(black is being put in urn 2)=7/12
if it is a white then p(white is being put in urn 3)=6/13
p(black is being put in urn 3)=7/13
if it is a black then p(white is being put in urn 3)=5/13
p(black is being put in urn 3)=8/13

u have to proceed like this this will lead to ans

ramyadiamond

then for each urn, there will be initially, to cases, that is 20 cases, and that will be doubled the second time. Its impossible to calculate so many.

ramyadiamond

cant we take the probability for the ball of a particular color from the 9th urn?, i.e., take the cases for the rest generally,

ramyadiamond

somebody plzzzzzzzzzzz help me with this, its been sooo long, i've got no replies. plz give me a proper answer.

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