A point is selected at random from the interior of a circle. The probability that the point is closer to the centre than the boundary of the circle is

Radius of the circle=r⇒n(S)=πr2                n(E)=π(r2)2=πr24             P(E)=πr24πr2=14 The probability that the point is closer to the centre than the boundary of the  circle is 14