Kris forwards an e-mail to 5 people. Each of those people forward that e-mail to 5 more people. If this happens two more times, which expression shows the total number of people who have received the e-mail, not including Kris?
A) 4*5
B) 1+5+5²
C) 5+5²+5³+5⁴
D) 5+5²+5³
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Answer:
D is the answer of the question
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