Simple probability problem

#1
A glass jar contains 55 red and 25 blue marbles. What's the probability of choosing a red marble 16 times in a row. After a pick the marbles don't go back in the jar.
Also what is the probability of picking 16 red marbles in a row if this experiment is repeated 10 and 20 times.

Thanks
 

Dason

Ambassador to the humans
#2
Hi! :welcome: We are glad that you posted here! This looks like a homework question though. Our homework help policy can be found here. We mainly just want to see what you have tried so far and that you have put some effort into the problem. I would also suggest checking out this thread for some guidelines on smart posting behavior that can help you get answers that are better much more quickly.