yes
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It is a relationship from one set to another, which is not a function.
Good question. A relation is simply that; any x-value to create any y-value. A function, however, cannot be defined for multiple values of x. In other words, for a relation to be a function, it must have singular values for all x within its domain.
some real world problems have more than one answer (output) given one input, these situations can be described by functions
False
One output for each input