If a(1), a(2) , ……. A(n) are in H.P., th...

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

`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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