Use a pattern to answer each question.
One week, you tell 3 of your friends a secret. The next week, each of them tells 3 people the secret and the next week each of those people tells 3 more people. So the first week, 3 new people know the secret; the second week, 9 new people know the secret; the third week, 27 new people know the secret, etc. How many people find out the secret on the 5th week?

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3*3*3*3*3
9*3*3*3
27*3*3
81*3
243

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