Which one of the following rational numbers has no reciprocal?

1.	Which one of the following rational numbers has no reciprocal?
A.	\[\frac{4}{7}\]
B.	\[\frac{9}{3}\]
C.	0
D.	\[\frac{5}{9}\]
Answer» D. \[\frac{5}{9}\]

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Which one of the following rational numbers has no reciprocal?

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