Remainder problem

2 replies [Last post]

Fri, 2007-10-05 15:43

dip.smart's picture

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Joined: 2007-08-04

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

Plz explain it........

Regards,

Dipanjan

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Fri, 2007-10-05 17:20

#1

rajesh_6e's picture

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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

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Sat, 2007-10-06 11:45

#2

Dipanjan (not verified)

Dipanjan's picture

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

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

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