Difference between revisions of "2007 iTest Problems/Problem 11"
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Revision as of 22:52, 4 October 2014
Problem 11
Consider the "tower of power" $2^{2^{2^{\cdot^{\cdot^\cdot^{2}}}}}$ (Error compiling LaTeX. Unknown error_msg), where there are 2007 twos including the base. What is the last (units digit) of this number?