HCU MCA 2014 Paper

A purse contains a 1 -rupee coin and three 1 -dollar coins, a second purse contains two 1-rupee coins and four 1 -dollar coins, and a third purse contains three 1 -rupee coins and a 1 -dollar coin. If a coin is taken out from one of the purses selected at random, find the probability that it is a rupee. (HCU-2014)