The words are not used for the representation of function. Hence, option (C) is correct.
The mathematical expression that defines the relationship between one variable with the another variable, is known as a function.
(A)
The functions can be represented by using the equations. For example -
f(x) = 4x +5y
Here, x and y are the variables and f(x) is a function. Hence, equation is used to represent a function.
(B)
The mapping diagram is used to show the paired elements from one set to another set. Generally, it is like a flow chart of a function. Hence, mapping diagram is also used to represent a function.
(C)
The words have no use to represent a function. One can explain the meaning of function by words, but there is no actual requirement to define a function by using words. Hence, words are not used to represent a function.
(D)
The graphs are the pictorial form to represent a function by mean of lines and points. Graphs has x and y variables in general along their respective axes, known as Abscissa and Ordinate. Hence, graphs are used to represent a function.
(E)
Within a function, frequency tables are use to manage the records and number of observations. Hence, frequency tables are used to represent a function.
(F)
Input Output table shows the variation of values with respect to another variables within the function. So, it is also a tool to represent a function.
Thus, we can conclude that words are not used for the representation of function. Hence, option (C) is correct.
Learn more about the functions here:
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