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a/U1 = 1
b = U2 - U1 = U3 - U2 = 3 -1 = 5 - 3 = 2
n = 20
Un = a + (n-1)*b
U20 = 1 + (20-1)*2
U20 = 1 + 19*2 = 39
atau, rumus untuk mencari bilangan ganjil ke-n = 2n - 1
Jika n = 20, maka
U20 = 2*20 - 1 = 40 - 1 = 39 <--
semoga membantu :)