Mathematics · Progression
If a 1 , a 2 , a 3 , ... are in Harmonic Progression (H.P.), then the expression a 1 a 2 + a 2 a 3 + ... + a n-1 a n is equal to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1(n - 1)a 1 a n✓
- 2na 1 a n
- 3(n - 1)(a 1 - a n )
- 4n(a 1 - a 2 )
Correct answer
(n - 1)a 1 a n
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