A bag contains 3 red, 4 black and 5 green identical balls. Two balls are…

Mathematics WAEC 1996

A bag contains 3 red, 4 black and 5 green identical balls. Two balls are picked at random, one after the other without replacement. Find the probability that one is red and the other is green

  • 2/3
  • 5/11
  • 5/22 checkmark
  • 5/24
  • 5/48

The correct answer is: C

Explanation

Total balls = 12
RG or GR
3/12
x
5/11
+
5/12
x
3/11

5/44
+
5/44
=
10/44
=
5/22
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