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January 28, 2015

January 28, 2015

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

Draw a tree diagram for the experiment &

Find the probability of opening the door on the first or second try.

- Math -
**Reiny**, Saturday, November 24, 2012 at 2:07pmprob of picking the right key = 2/5

prob of opening on first try = 2/5

prob of opening on 2nd try = (3/5)(2/5) = 6/25

(2nd try has to be Miss, Success)

prob of 1st OR 2nd try

= 2/5 + 6/25 = 16/25

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