Hello, hc215!

Companies M, Q and R supply machine parts in a 5:3:2 ratio respectively.

0.2% of the parts from M are defective.

0.1% of the parts from Q are defective.

0.5% of the parts from R are defective.

We have the following data:

. .

For two machine parts chosen at random, calculate the probability that:

a) Both are supplied from M and both are defective.

b) Both supplied by one of the other companies and both are defective.