Marbles 5: White
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 white marble is taken out.
How many marbles will need to be taken out at most, to guarantee that we will get a white marble?
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1 solution
You need to take out first the non-white marbles until the three white marbles are left, then take one white marble. There are 32 non-white marbles. So you need to take out 33 marbles.