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u7= 26
b= 26-14 / 4 = 3
a = 14-3-3 = 8
sn = n/2 ( 2a+(n-1)b)
s18 = 18/2 (16 + 6)
s18 = 198
jawaban terbaik kalo bisa :)
DITANYA: S18 ?
PENY: Un: a + (n-1) b
U3: a + 2b = 14
U7: a + 6b = 26
(u3 dan u7 di eliminasi) dan mendapat hasil a=8 dan b=3
u18= 8 + (18-1) 3
8+ (17)3
8+ 51
59
Sn= 1/2n(a+Un)
s18= 1/2 18 (8+59)
9 ( 67) = 603