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A box has 7 white balls,9 red balls and 5 green balls, At least how many balls would you have to take in order to ensure that you have 3 balls of same colour?

 Mar 10, 2020
 #1
avatar+111376 
+4

This  known as the "pigeonhole principle"

 

By  taking  7 + 5 + 3  =  15  balls  you are guaranteed  to end up with 3 red balls......

 

 

cool cool cool

 Mar 10, 2020
 #2
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Where does it say that they all have to be red ?

If you take six balls, you will either have three the same colour amongst them or three sets of two.

The seventh ball must then give you a set of three the same colour.

Guest Mar 10, 2020
 #3
avatar+109712 
-1

I think CPhill was showing how to do the question. I do not think he thought it was finished.

Melody  Mar 10, 2020

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