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How many balls must you pull out to be sure that there are at least two of one color among the balls picked out?

+1 vote
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A box contains 12 balls of three different colors.

4 each of red, yellow and blue.

If you were to be blindfolded and asked to pick them at random,

how many balls must you pull out to be sure that there are at least two of one color among the balls picked out?

posted Apr 13, 2018 by Amarvansh

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2 Answers

+1 vote

4.If in first 3 trials three are of different colours, than 4th will be there of any colour, making 2 of same colour.

answer Apr 13, 2018 by Subhash Gupta
+1 vote

If first three balls are different colors. Must be next one matching. so answer is 4

answer May 16, 2018 by Showman Biswas



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