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NMC 1991 Problem 1

  • Answer

Determine the last two digits of the number

25+252+253+⋯+2519912^{5}+2^{5^{2}}+2^{5^{3}}+\cdots+2^{5^{1991}}

written in decimal notation.

Dataset text NuminaMath olympiads. Quoted with source.

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Locator nordic/1991/p1 · Tag FBA973RAP1 · Edit this page on GitHub · Keys: j next, k previous