There is a bag filled with 4 blue and 5 red marbles.

Mathematics

1 answer:

kkurt [141]3 years ago

6 0

Answer:

Step-by-step explanation:

There are 4 blue, 5 red and total of 9 marbles.

If two marbles are taken and we are looking for exactly one red, then it is:

red, then blue or blue, then red

Find the probability of each case:

P(r, b) = 5/9*4/8 = 5/18
P(b, r) = 4/9*5/8 = 5/18

Probability of exactly one red:

P = 5/18*2 = 5/9

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