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Sn = n/2 (a + Un)
= 16/2 ( 7 + 52)
= 8 (59)
= 472 ....... jawaban : A
26) a = 3 ; r = 4 ; n = 5
Un = a .r^(n - 1)
= 3 . 4^(5 - 1)
= 3 . 4^4
= 3 . 256
= 768 ..... jawaban : B