Answer:
A fraction that is the multiplicative inverse of the given fraction
Step-by-step explanation:
Let's prove the possible answers wrong:
A fraction with 1 as a denominator could be 5/1. But a fraction could also have a 1 in the numerator, like 1/5. 5/1 and 1/5 are reciprocals
A fraction whose numerator and denominator have the same value. That means the only number possible is 1, when it is 1/1. But 5/1 can be a reciprocal as well
A fraction with the numerator as 1. Wrong, it can be 5/1 as well.
The last one is correct because is a reciprocal is when the numerator and the denominator is switched, or multiplicatively inverted.
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Hope everything is clear.