A) \[\frac{{{n}_{1}}}{{{n}_{2}}}\]
B) \[\frac{5{{n}_{1}}+7{{n}_{2}}}{3{{n}_{1}}+5{{n}_{2}}}\]
C) \[\frac{3{{n}_{1}}+5{{n}_{2}}}{5{{n}_{1}}+7{{n}_{2}}}\]
D) \[\frac{7{{n}_{1}}+3{{n}_{2}}}{5{{n}_{1}}+3{{n}_{2}}}\]
Correct Answer: B
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