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[" (2.7.) Leta,"a(1),a(3)" ,mund be in A...

[" (2.7.) Leta,"a_(1),a_(3)" ,mund be in AP.and "h_(1),h_(2),h_(3)" ,whand "a_(n)=25=n_(oo)" then "],[[" (a "h_(x)+a_(x)," h_n "_(n)" ) equal to: "," (B) "100," (D) "400]]

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