Tuesday
March 31, 2015

Homework Help: Math

Posted by Angie on Saturday, November 24, 2012 at 1:51pm.

You come home after dark, and porch light is out. You cannot tell which key opens the door.. you randomly try the 5 keys on your ring, 2 keys open your door.

Draw a tree diagram for the experiment &
Find the probability of opening the door on the first or second try.

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