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Recursion Quiz Question

Only recursively defined functions can be implemented recursively.
It is a True statement from quiz. How can this be justified, i cannot think of anyhting apart from recursion that can be carried out recursively


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Course: https://www.educative.io/collection/10370001/5474278013140992
Lesson: https://www.educative.io/collection/page/10370001/5474278013140992/5221870292959232

By definition, a recursively defined function is one that calls itself or uses its previous term for subsequent terms. There are functions/problems whose definition is not recursive but they contain a subproblem and hence can be redefined recursively and hence implemented recursively.