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A batch of 50 parts contains 10 parts made by Tool 1 and 40 made by Tool 2. a) How many ways to choose 2

A batch of 50 parts contains 10 parts made by Tool 1 and 40 made by Tool 2.

a) How many ways to choose 2 parts from the batch?

b) What is the probability that the 1st part comes from Tool 1 and the 2nd part came from Tool 2?

c) What is the probability that the 2nd part came from Tool 2, given that the 1st part came from Tool 1?

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