math/probability

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The Probability of drawing two black balls in succession from a bag containing 4 red and 3 black balls when the ball first drawn is
a) replaced
b) not replaced

  • math/probability -

    a) if replaced, prob = (3/7)(3/7) = 9/49

    b) if not replaced prob = (3/7)(2/6) = 1/7

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