If \( a_{1}, a_{2}, \ldots . a_{n} \) are in H.P., then the expression \( a_{1} a_{2}+a_{2} a_{3...
If \( a_{1}, a_{2}, \ldots . a_{n} \) are in H.P., then the expression \( a_{1} a_{2}+a_{2} a_{3}+\ldots .+a_{n-1} a_{n} \) is equal to
(1) \( (n-1)\left(a_{1}-a_{n}\right) \)
(2) \( n a_{1} a_{n} \)
(3) \( (n-1) a_{1} a_{n} \)
(4) \( n\left(a_{1}-a_{n}\right) \)
\( P \)
W.
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