d=a6 - a1 / 5 = 15 - 20 / 5 = - 1
S6 = 2*20 - 1*5 / 2 *6 = 105
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d=a6 - a1 / 5 = 15 - 20 / 5 = - 1
S6 = 2*20 - 1*5 / 2 *6 = 105