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rasio = u2/u1= 6/2=3
s8= a(r^8-1)/r-1 = 2(3^8-1)/3-1 = 2( 6561-1)2= 6560
semoga membantu
Ditanya : U8 ......?
Jawab : a x r pangkat n-1
= 2 x 3 pangkat 8-1
= 2 x 3 pangkat 7
= 2 x 2187
= 4374