Odpowiedź:
an = a₁qⁿ⁻¹
q = - 1/2
a₃ = a₁ * ( -1/2)² = a₁* 1/4 = a₁/4
a₁/4 = 5
a₁ =4 * 5 = 20
Odp: D
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Odpowiedź:
an = a₁qⁿ⁻¹
q = - 1/2
a₃ = a₁ * ( -1/2)² = a₁* 1/4 = a₁/4
a₁/4 = 5
a₁ =4 * 5 = 20
Odp: D