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U2 = 5 = 4 x 1 +1
U3 = 9 = 4 x 2 + 1
U4 = 13 = 4 x 3 + 1
Jadi Un = 4 x (n-1) +1
No.2 : U1 = 1 = 1^2 + (1-1)^2 = 1 + 0 = 1
U2 = 5 = 2^2 + (2-1)^2 = 4 + 1 = 5
U3 = 13 = 3^2 + (3-1)^2 = 9 + 4 = 13
U4 = 25 = 4^2 + (4-1)^2 = 16 + 9 = 25
Jadi Un = n^2 + (n-1)^2
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