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The numbers $a_n=6^n-5n$ for $n=1,2,3,.....$ when divided by 25 leave the remainder:

\[\begin {array} {1 1} (1)\;9 & \quad (2)\;7 \\ (3)\;3 & \quad (4)\;1 \end {array}\]

1 Answer

(4) 1
answered Nov 7, 2013 by pady_1
 

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