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Dit: n
Jawab: Sn = a(1-) ÷ (1-r)
80 = 2(1-) ÷ (1-3)
80 = 2 - 2×) ÷ (-2)
80×(-2) = 2 - 2×
(-160) = 2 - 2×
(-160)+(-2) = -2 ×
(-162) = -2 ×
= (-162) ÷ (-2)
= 81
n=4
Jadi, banyak suku barisan itu adalah 4.