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FoolForMath
 3 years ago
Just another cute number theory problem:
\((1)\) Find the remainder when \(100!^{100!}+99\) is divided by \(101\).
PS: This problem is posted on request of @Limitless
FoolForMath
 3 years ago
Just another cute number theory problem: \((1)\) Find the remainder when \(100!^{100!}+99\) is divided by \(101\). PS: This problem is posted on request of @Limitless

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mathmagician
 3 years ago
Best ResponseYou've already chosen the best response.0first, you should see that 100^k mod 101 is equal to 100, if k is odd and 1 if k is even. The same happens with 100!^k. So, 100!^100!=1mod 101 and 100!^100!+99=100 mod 101

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.4By Wilson's theorem, \[ 100! \equiv 1 \pmod {101} \] Since \(100!\) is even: \[100!^ {100!} \equiv 1 \pmod {101} \implies 100!^ {100!} +99 \equiv 100 \pmod {101} \] Hence, \(100\) is the remainder. Ref: http://en.wikipedia.org/wiki/Wilson's_theorem

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.4EDIT: \[ 100!^ {100!} \equiv 1 \pmod {101} \]\[\implies 100!^ {100!} +99 \equiv 100 \pmod {101} \]

KingGeorge
 3 years ago
Best ResponseYou've already chosen the best response.0You don't even need Wilson's Theorem for this. Since \(100!\) is a multiple of \(100\), and coprime to 101, we have that \(100!^{100!}\equiv1\pmod{101}\) by Fermat's Little Theorem. Hence, \(100!^{100!}+99\equiv100\pmod{101}\).
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