Question

A bag contains 3 red marbles and 4 blue
marbles. Two marbles are drawn at random
without replacement. If the first marble
drawn is red, what is the probability the
second marble is blue?
a) 3/7
b) 1/2
c) 4/7
d) 2/3​

Answer 1

Step-by-step explanation:

The probability of getting a blue marble from bag A is

3+4

4

=

7

4

And the probability of getting a red marble from bag B is

5+3

5

=

8

5

⇒ probability of getting a blue marble followed by a red becomes

7

4

×

8

5

=

14

5

Answer 2

Answer:

the probability :

d) 2/3