what are the last two digits of ?
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Now work on 65
Last edited by dwsmith; November 29th 2010 at 04:57 PM. Reason: Corrected carelessness
The post above me is not quite correct. So . So . So, . So the last two digits of are , not . NOW, work on .
Last edited by elemental; November 28th 2010 at 08:25 PM. Reason: formatting
I was thinking about inverses and congruence to 1 for some odd reason.
Originally Posted by earthboy what are the last two digits of ? Taking smaller moduli... Let . Note that . We can work separately modulo 25 and then modulo 4. Clearly divides , and thus divides . So . Both and are congruent to modulo 4. So . We combine and to get . (Since (25,4)=1.)
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