- #1

csb

- 2

- 0

Let's say

Jar 1 : B1, B3, B4, B7, B12 (5 unique balls)

jar 2 : B9, B7, B11, B15, B18 (5 unique balls)

jar 3 : B20, B1, B5, B17, B13 (5 unique balls)

jar 4 : B4, B5, B6, B3, B17 (5 unique balls)

jar 5 : B3, B10, B2, B14, B16 (5 unique balls)

and so on...

My question :

- What is the probability to observe one particular ball type in a jar ?
- What is the probability to observe one particular ball type in at least n jars ?

For question 1, can I say that the probability is 1/5 ? Or is it

^{5}C

^{1}/

^{20}C

^{5}? Or should I use more complicated thing like Stirling number of the second kind for this problem ? Totally not sure...

For question 2, once I know the probability from question 1, I can use binomial distribution, right ?

Thanks