1.

If a_(1), a_(2) , ……. A_(n) are in H.P., then the expression a_(1)a_(2) + a_(2)a_(3) + ….. + a_(n - 1)a_(n) is equal to

Answer»

`N(a_(1) - a_(n))`
`(n - 1) (a_(1) - a_(n))`
`na_(1),a_(n)`
`(n - 1)a_(1)a_(n)`

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