Q 1124867751.     Let `a_1 , a_2 , a_3 cdots cdots` be in harmonic progression with `a_1=5` and `a_20=25`. The least positive integer `n` for which `a_n <0`

JEE 2012
A

`22`

B

`23`

C

`24`

D

`25`

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