Balls in an urn

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.