Probability
posted by Mack .
Roberto has 10 different colored sheets of paper and 3 different colored envelopes. How many different letters can he make consisting of one colored sheet of paper and one colored envelope??? Please explain!

10 * 3 = ?
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11. Roberto has 10 different colored sheets of paper and 3 different colored envelopes. How many different letters can he make consisting of one colored sheet of paper and one colored envelope?
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