A bag contains 4 red marbles, 8 blue marbles and 2 green marbles. If two marbles are
drawn out of the bag, what is the probability, to the nearest 10th of a percent, that
both marbles drawn will be red?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.