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Verified answer
Jawab4,16, 28
a= 4
b= 12
disisipkan 3 bilangan misal = 4,,X,Y.Z, 16, A, B, C 28...
banyak sisipan k = 3
beda baru =b' = b/k+1
b' = 12/(3+1)
b' = 12/4
b' = 3
a= 4
sn = n/2 (2a + (n-1)b'
s8 = 8/2 (2. 4 + 7(3))
s8 = 4 (8 + 21)
s8 = 4 (29)
s8 = 116