Unmistakable 3609

We put 5 blue, 4 red, and 7 yellow balls in an unmistakable bag. Fero's task is to draw a yellow ball while blindfolded. How many marbles must Fero draw to be sure that a yellow marble will be among the ones drawn?

Correct answer:

n =  10

Step-by-step explanation:

n=5+4+1=10



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