A bag contains 7 red, 5 blue and 3 green balls. If 2 balls are picked at…
2019
A bag contains 7 red, 5 blue and 3 green balls. If 2 balls are picked at random, what is the probability that the first is red and the second is blue?
- A.
2/15
- B.
1/6
- C.
4/5
- D.
3/10
Attempted by 8 students.
Show answer & explanation
Correct answer: B
There are 15 balls in all. Without replacement, P(red first and blue second) = 7/15 x 5/14 = 35/210 = 1/6.