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U3 ⇒ a x r² = 36
r² = 2,25
r = √2,25
r = 1,5
a x r² = 36
a x 1,5² = 36
a x 2,25 = 36
a = 36/2,25
a = 16
suku pertamanya
U1 = a = 16
bedanya
b = 1,5