I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
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Assuming you can't look when you're choosing the marbles, I'd say 6. The worst case would be 1 red, 2 white, 2 black, then the sixth choice has to make a set of 3.
ReplyDeleteYup, 6.
ReplyDelete6
ReplyDelete6 is the least attempt to ensure dat we get atleast 3 marbles of same colour
ReplyDeleteI was hoping to throw you off the trail by using the 'one marble' solution on Friday, but I guess I should have known better.
ReplyDeleteSix is the answer. The worst case scenario here is when you pull two white, two black, and one red marble. The sixth marble will be either white or black, giving you three of either.