Posted by **nnnnn** on Monday, April 25, 2011 at 10:52am.

In a drawing for a DVD player, there are 100 tickets in a box. Five of the cards are marked with a star and the rest are marked with an X. To win, Carmen must draw two cards, without replacement, both of which are marked with a star. What is the probability that Carmen will win the DVD player?

1/500 ?

- math -
**MathMate**, Monday, April 25, 2011 at 11:41am
She has to draw one of 5 star cards out of 100, AND a second one of 4 star cards out of 99.

5/100 for the first AND 4/99 for the second.

To achieve both outcomes, the probabilities are multiplied together to get

(5÷100)*(4÷99)

=1/495

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