The question is:
John needs to choose randomly 20 chocolate coins from a jar containing 65 coins.
30 of the coins in the jar are green, 15 are yellow and 20 are red.
The parts I can't understand are:
Case 2 is: If all the coins from the same color are identical, how many different chioces are there ?
Part B: What is the probability that between the 20 coins that john will choose there will be 11 green coins and 4 yellow coins excatly?
About Case 2- It's the number of soloutions to the equation:
0<=x2<=15, 0<= x3<= 20... But how can I calculate this number?
About part B: I think the solution is but I'm not so sure...I'll be delighted to get some verification on this ....
Thanks in advance