If you keep giving the correct answer and didn't explain it goes to trash A committee...

If you keep giving the correct answer and didn't explain it goes to trash

A committee of 3 has to be chosen randomly from a group of 40 people . there are 40 people total are from 4 different countries. 10 from each country. What is the probability that the members of the committee are all from different country?

Why my answer is not correct? (4C1*10C1*3C1*10C1*2C1*10C1/ 40C3) you need to tell me what is wrong with my answer if you don't answer why my answer is not correct don't waste your time to answer, it will be reported

Solutions

Expert Solution

Let the four countries are A, B, C, D.

So the selection of three members from different country will be ABC, ABD, BCD, CDA

P(the members of the committee are all from different country) = 4 * (10C1 * 10C1 * 10C1)/40C3

= 4 * (10 * 10 * 10) * (3! * 37!)/40!

= 0.4049

orchestra answered 1 year ago

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