Pawan Prajapati
Last Activity: 3 Years ago
The total numbers of outcomes i.e. pens = 144
Given, numbers of defective pens = 20
∴ The numbers of non defective pens = 144-20 = 124
P(E) = (Number of favourable outcomes/ Total number of outcomes)
(i) Total numbers events in which she will buy them = 124
So, P (buying) = 124/144 = 31/36 = 0.86
(ii) Total numbers events in which she will not buy them = 20
So, P (not buying) = 20/144 = 5/36 = 0.138