Number Theory

September 18th, 2009 by ben Leave a reply »

Exercises for Hanchan:
(note to self, move this to private/password protected tomorrow)

1) Written out in base 10, the number 345! ends in how many zeroes?

2) The product of the 12-digit number 493,\!224,\!762,\!945 and the 12-digit number 471,\!910,\!894,\!925 is the 24-digit number 232,\!758,\!139,\!280,\!5A5,\!928,\!554,\!125 . Find the digit A.

Hey, Ben, this is K. Apparently I can edit this. I can also see all your private posts. You should probably fix this.

Fixed. Thanks.

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