If a₁, a₂, .........., are in H.P., then the expression a₁a₂ + a₂a₃ + .......... + is equal to
(a) n(a₁ - )
(b) (n -1)(a₁ - )
(c) na₁
(d) (n -1)a₁
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(b) (n -1)(a₁ - )
is the answer of the question
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