Suppose the joint probability distribution of $x$ and $Y$ is given by $f(x,y)=\frac{x+y}{138}$ for $x=4,5,6,7$;$y=5,6,7.$ Find $P(x>6,Y5)$ and $P(x>Y).$

a$.\frac{12}{138}$ and $\frac{36}{138}$

b$.\frac{12}{138}$ and $\frac{66}{138}$

c$.\frac{30}{138}$ and $\frac{14}{138}$

d$.19/138$ and $76/138$

e$.\frac{30}{138}$ and $\frac{66}{138}$