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An urn contains three red balls and white balls. Mr.  draws two balls together from the urn. The probability that they have the same colour is 1/2. Mr.  draws one balls from the urn, note its colour and replaces it. He then draws a second ball from the urn and finds that both balls have the same colour is: 5/8.The possible value of  is


Question ID - 153500 | Toppr Answer

An urn contains three red balls and white balls. Mr.  draws two balls together from the urn. The probability that they have the same colour is 1/2. Mr.  draws one balls from the urn, note its colour and replaces it. He then draws a second ball from the urn and finds that both balls have the same colour is: 5/8.The possible value of  is

1 Answer - 5876 Votes

3537

Answer Key : (1) -

(1)

There are  white balls in the turn

 Probability of Mr. A to draw two balls of same colour is

  (given)

 or 6   (1)

Also required probability for Mr.  according to the question is

   (given)

Solving, we get  or 9     (2)

From (1) and (2),



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