### Brain Teasers

# Bag of Balls

Probability
Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

### Answer

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## Comments

Nice easy one, you would have to take out all 56 non-reds first, then the 3 reds

good and easy, my favorite kind

Way too easy and color is spelled as seen not colour (Unless your British I guess)

im british. to be exact english

Sorry but it was a little bit too easy. Nice, though.

i cant submit any hard teasers. im too dumb to make them up lol

wow pretty good

this was really good . the only problem is i STILLdont get it!!

colour is the best way of spellling colour

colour color who cares. i enjoyed the puzzle easy enough to get yet fun.

thats the worstcase scenario

DUMB

what?

This question has nothing to do with probability.

udoboy...I totally agree...how is this probability?

you are looking for a probability of 100% if you want a harder version how many does he need to get a 42% chance of having 3 reds

very nice and very tricky!!

wrong category, but good teaser.

WAAAYY too easy. You must be VERY unlucky to take that many picks though.

And probability figures into this how?

Maybe if you wanted to know that there is a 8C2 / 64C58 = 28/74974368 = 1/2677656 (approx. 0.000000373) probability of having to pick 59 balls before getting three red balls. But as stated, this is neither a probability teaser nor an interesting teaser.

Maybe if you wanted to know that there is a 8C2 / 64C58 = 28/74974368 = 1/2677656 (approx. 0.000000373) probability of having to pick 59 balls before getting three red balls. But as stated, this is neither a probability teaser nor an interesting teaser.

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