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1. $t_{1}$

A. $x (\frac{1}{t_{1}} + \frac{1}{t_{2}})$
B. $x (\frac{1}{t_{1}} + \frac{1}{t_{2}})$
C. $x (\frac{1}{t_{1}} + \frac{1}{t_{2}})$
D. $x (\frac{1}{t_{1}} + \frac{1}{t_{2}})$

Answer: Option D

Explanation:

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