# A number x is chosen at random from the set $\;\{ 1,2,3,4,...,100\}\;$ .Define the event : A= the chosen number x satisfies $\;\large\frac{(x-10)(x-50)}{(x-30)} \geq 0\;$ Then P(A) is :

$(a)\;0.71 \qquad(b)\;0.70\qquad(c)\;0.51\qquad(d)\;0.20$