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Verified answer
Sn = n/2 ( 2a + ( n - 1 ) b )S20 = 20/2 ( 2.4 + ( 20 - 1 ) 5 )
••••• = 10 ( 8 + 95 )
••••• = 10 ( 103 )
••••• = 1.030
Jawaban : C
Catatan :
Sn = Jumlah suku ke n
a = U1 = Suku awal
b = beda = selisih