Question 1138817
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<pre>
Such problem, posed as a probability problem, must not only describe the content of a bag.


It must precisely describe the conditions of an experiment:


    - how much marbles are taking out at once,

    - with replacement or without it,

    - and so on.


How this problem is presented, clearly shows that


    - the problem is not from a textbook;

    - somebody is trying to create his (or her) own problem, but has no qualification to do it correctly.
</pre>

So, dear visitor, find an appropriate source/sources  and learn the subject before trying to create your own problems.



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