A) \[\frac{\alpha }{\beta }\]
B) \[\frac{\alpha +\beta }{\alpha -\beta }\]
C) \[\frac{{{\alpha }^{2}}+{{\beta }^{2}}}{\alpha \beta }\]
D) \[\frac{\beta }{\alpha }\]
Correct Answer: D
Solution :
\[{{R}_{1}}+{{R}_{2}}={{R}_{1}}(1+\alpha t)+{{R}_{2}}(1-\beta \,t)\] Þ \[{{R}_{1}}+{{R}_{2}}={{R}_{1}}+{{R}_{2}}+{{R}_{1}}\alpha t-{{R}_{2}}\beta t\]Þ \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{\beta }{\alpha }\]
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