A) $ \frac{x}{x_1}+\frac{y}{y_1}=2 $
B) $ \frac{x}{x_1}+\frac{y}{y_1}=\frac{1}{2} $
C) $ \frac{x}{x_1}+\frac{y}{y_1}=1 $
D)None of these
Correct Answer: A
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Answer:
Solution:
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