A bakery produces six different kinds of pastry, one of which is eclairs. Assume there are at least 20 pastries of each kind.
a) How many different selections of twenty pastries are there?
I was thinking combinations with repetition and order doesn't matter, so (n+r-1 r) but I'm not sure where n=120 and r=20?
b) How many different selections of twenty pastries are there if at least three must be eclairs?
(n+r-1 r) = (120+20-1 20) = (139 20) (20 3) ???
c) How many different selections of twenty pastries contain at most two eclairs?
(139 20) (20 2) ??

See more answers at brainly.com

Ask in Maths

I did :( But no one knows how to do it :/

I think the language in this one is rather confusing.

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

Looking for something else?

Not the answer you are looking for? Search for more explanations.