What is the power of 5 in (1!*2!......10!)*(1!*2!.....100!)*(1!*2!.....1000! )
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Originally Posted by itsmaximhere What is the power of 5 in (1!*2!......10!)*(1!*2!.....100!)*(1!*2!.....1000! ) Analyze the number of factor 5 in the brackets: (1!*2!......10!) contains (1!*2!.....100!) contains (1!*2!.....1000!) contains Not sure about the last line so check my arithmetic, please!
Last edited by earboth; Dec 2nd 2009 at 09:47 PM. Reason: typo
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