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Thread: easy probability

  1. #1
    An Urch Guru Pundit Swami Sage
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    Cool easy probability

    A fair coin is tossed three times. What is the probability that the coin will land tails up on the second toss?

    1/3
    1/2
    2/3
    3/4
    1/4

    Thanks

  2. #2
    An Urch Guru Pundit Swami Sage
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    for 3 coin toss we have,
    hhh
    hht
    hth
    htt
    thh
    tht
    tth
    ttt

    hence P(coin will land tail up on second toss) = 4/8 = 1/2. IMO B.

  3. #3
    Within my grasp!
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    (B)

    Each toss is independent of the other. So we need not concern ourselves with what happens in the 1st and 3rd toss. We just need to find the probability of getting a tail in a single toss of an unbiased coin.

    So probability of getting a tail in second toss = 1/2

  4. #4
    An Urch Guru Pundit Swami Sage
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    Thanks Nice explanation by gmatfundoo

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