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Find the last two digits of the following sum: 5! + 6! + 7! + 8! + 9! + 10! + ... + 100!

 Aug 6, 2021
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120 + 720 + 5040 + 40320 + 362880 + 3628800......

 

which is 20 + 20 + 40 + 20 + 80 + 00 +00 +00.......,

 

which means last two digit is: 80

 Aug 7, 2021

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