Balls in an urn

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Just enter your exercise

In an urn, there are

black balls ,
red balls ,
yellow balls ,
blue balls ,
green balls ,
white balls .

balls are being drawed placing them back.


Urn model

What's this about?

This is a calculator for an important stochastic experiment: Assume you put differently coloured balls into an urn and take some of them. A tree diagram helps you to calculate the probabilities of e.g. getting a red ball first and a blue one second.