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barisan geometri 2,6,18
Ditanyakan :
Penyelesaian :
U₂ = a.r = 6
U₃ = a.r² = 18
Maka :
a.r² = 18
a.r.r = 18
6.r = 18
r = 18/6
r = 3
Maka nilai a:
a.r = 6
a.3 = 6
a = 6/3
a = 2
Jadi Suku ke 11, yaitu :