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The probability of not picking a purple marble out of a bag of marbles is 2/5, if 2 purple marbles are taken out of the bag, reducing the number of purple marbles to 4, what will the new probability of picking a purple marble be?

  • math -

    3/5 chance beofre of picking a purple marble

    3/5 = 2+ 4

    the rest of marbles = 4
    so 4 / 4+4 = 1/2

  • For Sam - math -

    Even if tossing around a few numbers often yields the "correct answer", the statements must be mathematically correct and logically sound
    look at your statement:
    3/5 = 2+4 , now that is news to me, I always thought 2+4 is 6 and not 3/5
    Do you see what I mean ?
    .....................

    If prob of NOT picking a purple is 2/5
    then prob of picking a purple is 3/5

    We know that originally there were 6 purples, it was given.
    let the total number of marbles be x

    so we know that 6/x = 3/5
    3x = 30
    x = 10

    so at the start, there 10 marbles, of which 6 were purple
    after the take-out, there are 8 left of which 4 are purple
    so new prob = 4/8 = 1/2

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