Urn 
contains 6 red and 
black balls and urn 
contains 
red and 
black balls. One ball is drawnat random from urn 
and placed in urn 
. Then one ball is drawn at random from urn 
and placed inurn 
. If one ball is now drawn at random from urn 
, the probability that it is found to be red, is 
.Find 
.
Text Solution
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32
Let the events are
red ball is drawn from urn 
and placed in 
black ball is drawn from urn 
and placed in 
red ball is drawn from urn 
and placed in 
black ball is drawn from urn 
and placed in 
red ball is drawn in the second attempt from 
Then the required probability
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