Let E1,E2 and E3 denote the stock from C1,C2 and C3 respectively. Let A be event that refrigerator sold at random is found to be defective by a customer. begin‌gathered‌P(E1)=‌
25
100
,P(E2)=‌
35
100
,P(E3)=‌
40
100
\P(‌
A
E1
)=‌
3
100
,P(‌
A
E2
)=‌
2
100
⇒P(‌
A
E3
)=‌
1
100
‌end‌gathered Using Baye's theorem, we get A(Σ2∕A)‌=‌