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a2 = 8/7 - 16/15 = 8·(1/7 - 2/15) = 8/105
a3 = 15/7 - 31/15 = 8/105 ⇒ a1 = a2 = a3
b) a1 = a2 = a3 = ..........= a105 ⇒ S = 105·8/105 = 8 ∈N