Question

There are 4 marble—red (R), blue (B), green (G), yellow (Y) — in a bag. We randomly draw marble without replacement from the bag. A) What i the probability that the firt drawing i red and the econd

drawing i yellow?

Answer 1

1/12

but why?

the first time you have a 1/4 chance, and the second time you have a 1/3 chance. since this is an AND event, we will multiply them together and get 1/12