Question: Show that 42/821 = 2/ (using first isomorphism) theorem I want to prove kerf=82, Imf = 2/ (f is surjective) and f is homomorphism

Show that 42/821 = 2/ (using first isomorphism) theorem I want to

Show that 42/821 = 2/ (using first isomorphism) theorem I want to prove kerf=82, Imf = 2/ (f is surjective) and f is homomorphism I could not define the functionfiliZ-82

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