Half of the cards are red, and half are black. The possibility of him drawing red the first time was 
. The possibility of drawing black the second time was also . To find the possibility of both, simply multiply by itself. What is 
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The probability of drawing red on the first draw is 20/36. Having drawn red on the first draw, the probability of drawing red on the second draw is 19/35. The probability that both marbles are red is therefore;
