Among the following relations, the Function is option D,{1,2,2,3,3,4,4,5}.
In simple words, a function is a relationship between inputs where each input is related to exactly one output. Functions are often defined by a formula that describes a combination of arithmetic operations
A function is uniquely represented by the set of all pairs (x, f (x)), called the graph of the function, a popular means of illustrating the function. To identify a function from a relation, we just have to see if any 'x' values are being repeated, if not, it is a function. If x values are repeated, and y values are different, then we have a relationship and not a function.
In the question, we can see that values 2,3, and 4 are repeating. This specifies that they are a function.
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