Remainder problem

Submitted by dip.smart on Fri, 2007-10-05 15:43

Q.What is the remainder of (1!+2!+3!+........+20!)/20.

Plz explain it........

Regards,

Dipanjan

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Posted on: Fri, 2007-10-05 17:20 #1

Joined: 2007-07-30

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ans=13

5!+6!+....20! gives rem 0 on div by 20

so eff. ans is rem. of 1+2!+3!+4!/20

=13

Posted on: Sat, 2007-10-06 11:45 #2

Dipanjan (not verified)

Thankz.......................

Thankz.........................

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