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2000 AMC 10 Problem 2

Problem 2 of 25EasierAlgebra

Which of the following is equal to 200020002000?2000 \cdot 2000^{2000}?

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Solution

Write the factor 20002000 as 20001.2000^1. Then 2000120002000=20001+2000=20002001. \begin{aligned} 2000^1 \cdot 2000^{2000} &= 2000^{1 + 2000} \\ &= 2000^{2001}. \end{aligned} Each of the other options is larger than 20002001.2000^{2001}. Thus, the correct answer is A.

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Concepts: exponent

Problem text and solution from the LIVE past-contest archive. See also the AoPS wiki page for community solutions.