If the 10th term of an A.P. is ${1 \over {20}}$ and its 20th term is ${1 \over {10}}$, then the sum of its first 200 terms is

Question

If the 10^th term of an A.P. is ${1 \over {20}}$ and its 20^th term is ${1 \over {10}}$, then the sum of its first 200 terms is

100

$100{1 \over 2}$

$50{1 \over 4}$

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