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In a class of 20 pupils, 11 have dark hair, 7 have blond hair and 2 have red hair. 2 Pupils are chosen at random to collect the homework. What is the probability that each have a different colour hair?

The correct answer is 266/380

However I thought it would be 99/380. I arrived at that answer in the following way:

11/20 x 9/19 = 99/380

Where did I go wrong?

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# Homework Help: Probability problem

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