How many ways to select 2 balls but not both same colour?

In a box there are 5 different black balls, 3 different white balls and 2 different red balls. How many ways to select 2 balls but not both same colour?

  1. 40
  2. 31
  3. 30
  4. 25
Anurag Mishra Professor Asked on 27th December 2015 in Reasoning Questions.
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Answer:  (2) 31

Anurag Mishra Professor Answered on 27th December 2015.
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