If a 1 , a 2 , a 3 , .......a n be an A.P. of non-zero terms, then the value of 1 a _ 1 a…
Mathematics · JEE Main · NTA Exams — Progression and Series
If a1, a2, a3, .......an be an A.P. of non-zero terms, then the value of \(\frac{1}{\mathbf{a}_{1} \mathbf{a}_{2}}+\frac{1}{\mathbf{a}_{2} \mathbf{a}_{3}}+\ldots+\frac{1}{\mathbf{a}_{n-1} \mathbf{a}_{n}}\) is
- \(\frac{n}{a_{1} a_{n}}\)
- \(\frac{n}{2}\left(\frac{1}{a_{1} a_{n}}\right)\)
- \(\frac{n-1}{a_{1} a_{n}}\)
- None of these
Answer
(D) None of these
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