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b = 5
n = 24
dit : S24...?
jawab:
Sn = 1/2n (2a+(n-1)b)
S24 = 1/2 x 24 (2(8)+(24-1)5)
S24 = 12 ( 16 + 115)
S24 = 12 x 131
S24 = 1572
b = 38 - 18
7 - 3
= 20 = 5
4
Cari a (suku pertama)
u3 = a + (n-1).b
18 = a + (3-1) .5
18 = a + 2 . 5
18 = a + 10
a = 18 - 10
a = 8
Dicari s24
sn = n/2 (2a + (n-1).b)
s24 = 24/2 (2×8 + (24-1)×5)
s24 = 12 (16 + 23×5)
= 12 (16 + 115)
= 12 × 131
=1572