Ответ: 3225
S = (2a1 + d(n-1)) / 2 * n;
S₃₀ = (2 * 6 + 7 (30 - 1) ) / 2 * 30 = (12 + 203) / 2 * 30 = 107.5 * 30 = 3225
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Ответ: 3225
S = (2a1 + d(n-1)) / 2 * n;
S₃₀ = (2 * 6 + 7 (30 - 1) ) / 2 * 30 = (12 + 203) / 2 * 30 = 107.5 * 30 = 3225