Given, total number of mobile phones
n(S) = 48
(i) Let E1 = Event that Varnika will buy a mobile phone
= Varnika buy only, if it is good mobile
∴ n(E1) = 42
(ii) Let E2 = Event that trader will buy only when it has no major defects
= Trader will buy only 45 mobiles
∴ n(E) = 45