Hence the result is.This is the easiest way to solve. Another apporach is using phi function.

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Hence the result is.This is the easiest way to solve. Another apporach is using phi function.

$Since, 7^{4}\equiv 01 mod 100. \Rightarrow 7^{80}=01 mod 100 multiply both side by 7, we get 7^{81}=07 mod 100.$
Hence the result is.This is the easiest way to solve. Another apporach is using phi function.

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Hence the result is.This is the easiest way to solve. Another apporach is using phi function.

Hence the result is.This is the easiest way to solve. Another apporach is using phi function.

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$Since, 7^{4}\equiv 01 mod 100. \Rightarrow 7^{80}=01 mod 100 multiply both side by 7, we get 7^{81}=07 mod 100.$
Hence the result is.This is the easiest way to solve. Another apporach is using phi function.