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Professor Von-Strange has
another of his weird and wacky ideas; he wants to implant a second pair
of eyes on to the back of all human heads.
Fortunately at this time he has no real humans to experiment on - only
mannequins.
Von-Strange has been collecting glass eyes for this experiment and now
has 3 green, 3 blue and 3 brown eyes. These are placed in a machine that
will dispense one out at random at the press of a button.
How many times
will Von-Strange have to press the button to be sure he has three pairs
of matching eyes, if he doesn't check the colours as they are dispensed?
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