@openstudier101x

@MrNood

Jenna has a bag that contains 7 red marbles and 25 blue marbles. She selects a marble at random, and then, without replacing the first one, selects another marble at random.

What is the probability that Jenna selects a blue marble and then a red marble? Round your answer to the nearest percent.

P(blue and red) ≈ %

Question

@openstudier101x

@MrNood

Jenna has a bag that contains 7 red marbles and 25 blue marbles. She selects a marble at random, and then, without replacing the first one, selects another marble at random.
 
What is the probability that Jenna selects a blue marble and then a red marble? Round your answer to the nearest percent.
 
P(blue and red) ≈   %

anonymous · Answer

@tkhunny

tkhunny · Answer

Usual without replacement stuff.  As I've no recollection of you ever asking such a question, I'll give you one free one.

7 red
25 blue
32 total

p(red on first draw) = 7/32
p(blue on first draw) = 25/32

The problem is about half done.  Think about what happens after we removes one blue one.