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[" 13.Let "a(1),a(2),a(3),...," be in ha...

[" 13.Let "a_(1),a_(2),a_(3),...," be in harmonic progression with "a_(1)=5" and "a_(20)=25" .The least positive integer "n" for which "],[a_(n)<0" is "[" (A) "22," [lIT-JEE "2012," Paper-2,"(3,-1),66]],[" (A) "23," (C) "24," (D) "25]]

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