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b = -120
S16 = n/2 . (2a + (n - 1) . b)
S16 = 16/2 . (2 . 1960 + (16 - 1) . (-120))
S16 = 8 . (3920 + 15 . (-120))
S16 = 8 . (3920 - 1800)
S16 = 8 . 2120
S16 = 16960
dengan:
a = 1960
b = -120 ( karena turun )
Un = U16
Dit : S16
Cari Un
U16 = a + (n -1)b
= 1960 + (16-1) x -120
= 1960 + (15 x -120)
= 1960 -1800
= 160
Sn = n/2 ( a + Un)
= 16/2 x ( 1960 + 160)
= 8 x 2120
=16.960
maafkalausalah.nantidiedit~