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r = 4
S5 = a (r^5 - 1) / (r-1)
= 3(1.024 - 1 / (4-1)
= 3 (1023) / 3
s5 = 1.023
= 3((4pangkat5)-1)/4-1 = 3(1024-1)/3 = 3069/3 = 1023
Good Luck! :D