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Verified answer
Jawab9+ 6 + 4
a= 9
r= 2/3
s7 = a ( 1 - r^7)/ (1 - r)
s7 = 9 .(1 - (2/3)^7) /( 1 - 2/3)
s7 = 27. (2059/2187)
s7 = 25 ³⁴/₈₁