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माना f sube Z xx Z निम्नवत परिभाषित है- ...

माना `f sube Z xx Z` निम्नवत परिभाषित है-
`f{(ab, a +b) : a, b in Z}`
क्या f, Z से Z में एक फलन है? अपने उत्तर का औचित्य भी बताइए ।

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