If the $10^{\text {th }}$ term of an A.P. is $\frac{1}{20}$ and its $20^{\text {th }}$ term is $\frac{1}{10}$, then the sum of its first 200 terms is
$50 \frac{1}{4}$
$100 \frac{1}{2}$
50
100
Correct Option: , 2
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