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Suppose probability of drawing a red marble is p.

Then p = 2*(1 - p)

that is p = 2 - 2p

or p = 2/3

So 2/3 of the 24 marbles are red

24*(2/3) = 16 red marbles.

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Q: If you have a bag containing 24 marbles If the probability of drawing a red marble is twice as likely not drawing a red marble how many red marbles are in the bag?
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