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ar⁴ = 162
ar⁴/ar = 162/6
r³ = 27
r = 3.................opsi C
29. ar³ = 2
ar⁵ = 1/2
ar⁵/ar³ = (1/2)/2
r² = 1/4
r = 1/2
ar³ = 2
a = 2/r³
a = 2/(1/2)³
a = 2.8
a = 16.................opsi D
30. a = 64
ar² = 16
ar²/a = 16/64
r² = 1/4
r = 1/2
S∞ = a/(1-r)
= 64/(1-(1/2))
= 64/(1/2)
= 128...................opsi B