A box contains 12 marbles of three colors – green, yellow & blue – 4 each. If you were to close your eyes & pick it up, how many marbles must you take out to be sure that there are at least 2 of one colour among the marbles picked out.(SakDevi-73).Try with 20 marbles also.

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Nazish

  • Feb 10th, 2015
 

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