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Un = a + ( n - 1 ) b
U100 = 8 + ( 100 -1 ) 4
U100 = 8 + 99. 4
U100 = 8 + 396
U100 = 404
S100 ?
Sn = 1/2 n ( a + Un )
S100 = 1/2 100 ( 8 + 404 )
S100 = 50 ( 412 )
S100 = 20.600
Maaf kalau salah