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Mathematics

Algebra

Easy

Question

$Let space a subscript 1 comma a subscript 2 comma a subscript 3 midline horizontal ellipsis space space be space straight a space harmonic space progression space such space that space a subscript 1 equals 5 space space and space space a subscript 20 equals 25 Least space value space of space straight n space which space a subscript n less than 0 space space is space space$

$22$
$23$
$24$
$25$

The correct answer is: $25$

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