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    VINOD SAWALE's Avatar
    VINOD SAWALE Posts: 1, Reputation: 1
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    #1

    Feb 13, 2010, 02:38 AM
    probability formula
    What is the probability of an ace or space or both the dew of cards , the answer options are 1/13 , 2/13 , 3/13 , 4/13 , please tell me the right option
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 13, 2010, 10:57 AM

    The probability of an ace or a spade.



    The probability of an ace is 4/52.

    The probability of a spade is 13/52

    But, we have to subtract off the ace of spades else we double count it.

    4/52+13/52-1/52
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