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Kelas 8 MatematikaBab Barisan dan Deret Bilanga
a] r = U2/U1
r = 240/480
r = 1/2
Un = a . rⁿ⁻¹
Un = 480 . (1/2)ⁿ⁻¹
b] b = U2 - U1
b = 21 - 8
b = 13
Un = a + (n - 1) . b
Un = 8 + (n - 1) . 13
Un = 8 + 13n - 13
Un = 13n - 5