Mathematics · Progression and Series
If a1, a2, a3, ..., an are in H.P., then the expression a1a2 + a2a3 + ... + an-1an is equal to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1(n - 1) a1 an✓
- 2n a1 an
- 3(n - 1)(a1 - an)
- 4n(a1 - a2)
Correct answer
(n - 1) a1 an
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