GW008

P={ z + x*y/(y+a) > x/(x*k+1)} where x,y,z are exponentially distributed with mean xbar,ybar,zbar. a,k are constants. please suggest me how to evaluate this probability..... for k=0, P lies between 0 and 1 but for any positive value of k, P become higher than one which is unacceptable.... take xbar=1 ybar=3.14 zbar=1