A chain letter starts when a person sends a letter to 4 others. Each person who receives the letter either sends it to 4 other people who have never received it or does not send it to anyone. Suppose that 20 people send out the letter before the chain ends and that no one receives more than one letter. (a) How many people receive the letter? (b) How many people are there in the chain letter? (c) How many people do not send it out?

Q: Modern

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