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    happy people's Avatar
    happy people Posts: 1, Reputation: 1
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    #1

    May 18, 2009, 08:16 PM
    Probability of coins
    If you flip a coin twice. Event A is getting a head on the second flip and event B is getting a head on the first flip.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    May 18, 2009, 08:59 PM

    So, what's your question?

    The probability of getting a head on the first flip is 1/2. The probability of getting a head on the second flip is also 1/2. The second event is independent of the first event (it doesn't matter what you flipped the first time and vice-versa).

    The probability of getting two heads is 1/2 x 1/2 = 1/4. The probability of getting two tails is the same.
    The probability of getting one head and one tail in two throws is 1/2.
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