Suppose you have:
a function f(A) which takes some finite set of strings A as input, and outputs the cardinality of A ; and a function g(B, C) which takes two finite sets of strings B and C as input, and outputs the Cartesian product B imes C . Which of the following statements is true?

Question

Suppose you have: 
 a function   f(A)  which takes some finite set of strings   A  as input, and outputs the cardinality of   A ; and a function   g(B, C)  which takes two finite sets of strings   B  and   C  as input, and outputs the Cartesian product   B 	imes C . Which of the following statements is true?

Answer

g \circ f  is defined, but   f \circ g  is not.

Answer

f \circ g  is defined, but   g \circ f  is not.

Answer

Neither   g \circ f  nor   f \circ g  are defined.

Answer

Both   g \circ f  and   f \circ g  are defined.

Crowdly

Suppose you have: a function f(A) which takes some finite set of strings ...

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