@HeadShot 2 @Mk Utkarsh .how to solve the last step? Pls mention the source or tell the method...even i have applied Fermat's theorem..still i am mot able to solve it

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In a RSA cryptosystem a participant uses two prime numbers p and q is 17 and 11 respectively to generate his/her public and private keys...If the public keybof participant is 7 and cipher text C is 11 then the original message M is_________

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@HeadShot 2 @Mk Utkarsh .how to solve the last step? Pls mention the source or tell the method...even i have applied Fermat's theorem..still i am mot able to solve it