marbles

AndrewTom

A bag contains hundreds of glass marbles, each one coloured either red, orange, green or blue. There are more than $2$ marbles of each colour.
Marbles are drawn randomly from the bag, one at a time, and not replaced.
How many marbles must be drawn from the bag in order to ensure that at least three marbles of the same colour are drawn?

**Posted:** Fri Nov 06, 2009 2:08 am

isabella2296

The worst case scenario is 2 red marbles, 2 orange, 2 green, and then 2 blue. Whatever marble is drawn afterwards will be a third, so we have 9.

**Posted:** Fri Nov 06, 2009 4:45 am

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