Answer
a) not a function
b) is a function
c) is not a function
Work Step by Step
a)This is not a function because the rule is not well-defined. We do not know whether f (n) = n or f (n) = n.F or a function, it cannot be both at the same time.
b)This is a function. F or all integers n, f gives a well-defined real number
c)This is not a function with domain Z, since for n = 2 and n = 2 the value of f (n) is not defined by the given rule. In other words, f (2) and
f ( 2) are not specified since division by 0 makes no sense.
