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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.
one year ago

Saurabh Koranglekar
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one year ago
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### Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions