If the 10^th term of an A.P. is


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

  1. $50 \frac{1}{4}$

  2. $100 \frac{1}{2}$

  3. 50

  4. 100

Correct Option: , 2


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