Shortcut trick for calculating no. of group homomorphism from Z10 to Z20 || MODERN ALGEBRA

In this video, question from CSIR NET MATHEMATICAL SCIENCE EXAM is discussed.
In this video, we are required to calculate no. of group homomorphism from Z10 to Z20.
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Another method for calculating no. of group homomorphism from Z10 to Z20 :-
Shorts link:-th-cam.com/users/shortsiZXRyckkphs?si=1xAMYBx2Ikf9vMJH