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Three numbers are chosen at random from the set {1, 2, 3, ..., 9}.  Find the probability that they add up to 20.

 Dec 2, 2019
 #1
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You do not need our help to do this.

Work out all the triples that add to 20

and put it over 20C3

 

You have been asking a great many probability question. 

It seems you want us to do all your homework for you but when you get an answer you are rude about it.

 

You are not even smart enough to recognise what side of the bread has butter. 

 Dec 2, 2019
edited by Melody  Dec 2, 2019

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