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1458/2 = q⁶
q⁶=729
q=3 lub q=(-3)
S₇ = a₁ × (1-q⁷)÷(1-q)
Dla q = 3
S₇ = 2×(1 - 2187)÷ (-2) = 2186
Dla q=(-3)
S₇= 2x( 1 - (-2187))÷(1-(-3)) = 2×2188÷4 = 1094