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Let $n= 1 !+ 4 !+7 !+.............+400 !$. Then ten's digits of $n$ is :

\[\begin {array} {1 1} (1)\;1 & \quad (2)\;6 \\ (3)\;2 & \quad (4)\;7 \end {array}\]

1 Answer

(2) 6
answered Nov 7, 2013 by pady_1
 

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