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If the 10^th term of A.P. is 1/20 and its 20^th term is 1/10. then the sum of its first 200 terms is

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If the 10th term of A.P. is 1/20 and its 20th term is 1/10. then the sum of its first 200 terms is

(1) 50(1/4)

(2) 100(1/2)

(3) 50

(4) 100

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Answer is (4) 100(1/2)

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Answer is (2) 100(1/2)

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