Question

A box contains six red, three green, and four blue balls. In how many ways is it possible to select a sample of four balls, without replacement, in which at most three are red?

Answer 1

its a combination of 13 choose 4 ways=715

Answer 2

could yu please tell mewhere can I find some lessons/theory for probabilty and combinatorics???

tahnk you!!!

franceskaXh

Answer 3

let me know if this helps: http://www.mathgoodies.com/lessons/toc_vol6.html