SOLUTION: Find the tens digit of the number: 1!+2!+3!+4!+...+1999!+2000!

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Question 584523: Find the tens digit of the number: 1!+2!+3!+4!+...+1999!+2000!
Answer by dfrazzetto(283) About Me  (Show Source):
You can put this solution on YOUR website!

(1 !) + (2 !) + (3 !) + (4 !) + (5 !) + (6 !) + (7 !) + (8 !) + (9 !) + (10 !) = 4 037 913
everything after 10! will have a 0 in the 1 and 10s digit place, so it will continue to be 1