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a3=18*1/2=9
a4=9*1/2=4,5
Odp. C
a4 = ?
q = a2/a1 = 18/36
q = 1/2
an = a1 * q^{n-1}
a4 = 36 * (1/2)^{3 = 36 * 1/8
a4 = 4,5