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dari data diatas, diketahui :
a = 4
b = U2 - a = 1 - 4 = -3
Un = -77
n = ?
pakai rumus :
Un = a + (n - 1)b
-77 = 4 + (n - 1)-3
-77 - 4 = -3(n - 1)
-81 = -3(n - 1)
-81/-3 = n - 1
27 = n - 1
n = 27 + 1 = 28
jadi, bilangan -77 adalah suku yang ke-28.
maaf kalau salah
semoga membantu