An urn contains three red balls and n white balls. Mr. Roushan draws two balls together from the urn. The probability that he has the same colour is 12. Mr. Rajesh draws one ball from the urn, notes its colour and replaces it. He then draws a second ball from the urn and finds the probability that both balls have the same colour is 58. The possible value of n is

An urn contains three red balls and n white balls. Mr. Roushan draws t

1.	An urn contains three red balls and n white balls. Mr. Roushan draws two balls together from the urn. The probability that he has the same colour is 12. Mr. Rajesh draws one ball from the urn, notes its colour and replaces it. He then draws a second ball from the urn and finds the probability that both balls have the same colour is 58. The possible value of n is
Answer» An urn contains three red balls and $n$ white balls. Mr. $Roushan$ draws two balls together from the urn. The probability that he has the same colour is $\frac{1}{2}$ . Mr. $Rajesh$ draws one ball from the urn, notes its colour and replaces it. He then draws a second ball from the urn and finds the probability that both balls have the same colour is $\frac{5}{8} .$ The possible value of $n$ is