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[" 1) A.P "],[" 61.If "a(1),a(2),...,a(n...

[" 1) A.P "],[" 61.If "a_(1),a_(2),...,a_(n)" are in HP.then the expression "a_(1)a_(2)+a_(2)a_(3)+....+a_(n-1)a_(n)" is equal to "],[qquad (d)/(dx)(n-1)a_(1)a_(n)]

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