JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

1 Easy

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Application +4 | -1

Let

a_1, a_2, a_3, \ldots

be a harmonic progression with

a_1=5

and

a_{20}=25

. The least positive integer

n

for which

a_n<0

, is

View answer and explanation

Correct option: D

Option D (25) is correct because it is the smallest integer n for which

a_n < 0

, derived by analyzing the harmonic progression and its corresponding arithmetic progression.

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