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[" 59.If "a(1),a(2),a(3),......,a(n)" ar...

[" 59.If "a_(1),a_(2),a_(3),......,a_(n)" are in H.P.,"],[" then "a_(1)a_(2)+a_(2)a_(3)+.........+a_(n-1)a_(n)" will "],[" be equal to "]

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