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3 June, 07:33

What is the probability that the card is either a black cardblack card or aa 99 ?

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  1. 3 June, 07:59
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    It sounds like your book is asking "what is the probability that the card is either a black card or a 9"

    If so, there are 26 black cards (13 spades and 13 clubs) and four cards that have "9" on them (one in each suit). We have 26+4 = 30 cards that are either one or the other. There is overlap though. Namely the 2 black cards that have "9" on them (we count them twice), so we should subtract to get 30-2 = 28

    There are 28 cards that either have a '9' on them, they are black, or both

    This is out of 52 cards total

    Divide the two values: 28/52 = 14/26 = 7/13 = 0.53846

    Answer as a fraction: 7/13

    Answer in decimal form: 0.53846

    Answer as a percentage: 53.846%

    Side note: the decimal form and percentage form are approximate
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