Marbles 3: Red
There are 35 marbles in a bag. Of which 3 are white, 5 are blue, 8 are red, 9 are green and 10 are yellow. The marbles will be taken out at random until a red marble is taken out.
How many marbles will need to be taken out at most, to guarantee that we will get a red marble?
The answer is 28.
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1 solution
there are total 35 marbles
after taking out 27
there are 8 red left
so 28th marble will be definitely red