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Amy and three friends launch a new website. Each of the four friends e-mails the web address to three new friends. These new friends forward the web address to three more friends. If no one receives the e-mails more than once, how many people will receive the web address in the second wave of e-mails?

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4 people email 3 more people each so 12 people are emailed, then these 12 people email 3 more people each, so 36 people are emailed.

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