Final answer:
An improper fraction is a fraction in which the numerator is greater than or equal to the denominator. Among the options given, the only example of an improper fraction is 45.
Step-by-step explanation:
An improper fraction is a fraction in which the numerator is greater than or equal to the denominator. Among the options given, the only example of an improper fraction is 45. In this case, there is no whole number component and the numerator (45) is greater than the denominator (1).
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