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OMK 2010

Source: Malaysia National Olympiad 2010 Bongsu Category Problem 8

June 4, 2011
modular arithmeticnumber theory unsolvednumber theory

Problem Statement

Find the last digit of 71×72×73×⋯×72009×72010.7^1\times 7^2\times 7^3\times \cdots \times 7^{2009}\times 7^{2010}.
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