Report - DEVOIRSURVEILLE6 - spartan-entertainment.com · x k +1 x k par somme télescopique donc x n x 0 > nX 1 k =0 1 = n ... On en déduit : 8n 2 N ; 0 6 x n +1 x n 1 6 1 n (c) Soit n >

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