A) \[1\frac{18}{138}\]
B) \[2\frac{17}{138}\]
C) \[1\frac{17}{138}\]
D) \[3\frac{17}{138}\]
Correct Answer: C
Solution :
\[3\frac{21}{23}\div 3\frac{15}{31}=\frac{90}{23}\div \frac{108}{31}\] \[=\frac{90}{23}\times \frac{31}{108}=\frac{155}{138}=\underline{\mathbf{1}\frac{\mathbf{17}}{\mathbf{138}}}\]
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