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Let `a_1,a_2,a_3,...` be in harmonic progression with `a_1=5a n da_(20)=25.` The least positive integer `n` for which `a_n<0` `22` b. `23` c. `24` d.

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Let `a_1,a_2,a_3,...` be in harmonic progression with `a_1=5a n da_(20)=25.` The least positive integer `n` for which `a_n<0` `22` b. `23` c. `24` d. `25`<br>A. 22
B. 23
C. 24
D. 25
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Correct Answer - D
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