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A box contains 7 white and 5 black balls...

A box contains 7 white and 5 black balls three are drawn at random find the probability that they are not of the same colour when
one by one without replacement.

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PATHFINDER-PROBABILITY-QUESTION BANK
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  13. A box contains 7 white and 5 black balls three are drawn at random fin...

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  14. The probabilities of solving a problem by three students A,B,C are 3/7...

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  15. If the letters of the word MOTHER are arranged at random then find the...

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