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Algebra

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A box contains 15 blue marbles, 25 yellow marbles, 20 green marbles and 40 red marbles. How many ,arbles must you select to be sure that a green marble has been chosen ?

  • Algebra -

    Since you can pick 15+25+40=80 marbles and get no greens, you must pick 81 to be sure that at least one is green.

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