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Ditanyakan = Rumus jumlah suku ke-n = ..?
Sn =
Sn =
Sn =
Sn =
Sn =
b = 90 - 100 = - 10
Un = a + (n - 1)b
= 100 - 10(n - 1)
= 110 - 10n
Sn = (n/2)(a + Un)
= (n/2)(100 + 110 - 10n)
= (n/2)(210 - 10n)
= 105n - 5n²