Question 1151261
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From the context, the marbles differ by their colors only (since the opposite is not stated).


Let R be the number of red marbles among 5 selected marbles.


Then the number of different cases (the number "in how many ways can this be done") is equal to the number of solution to this inequality


    1 <= R <= 5.


The number of solution is 5.


Therefore, the <U>ANSWER</U> to the problem's question is 5.
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