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Pola ke-10 = 4n
= 4.10
= 40 lingkaran
Pola ke-100 = 4n
= 4.100
= 400 lingkaran
Sehingga, pola ke-n = 4n
No. 1
Un = 2 (n-1) + 2
U10 = 2 (10-1) + 2
= 2 (9) + 2
= 18 + 2
= 20
U100 = 2 (100-1) + 2
= 2 (99) + 2
= 198 + 2
= 200
U10 = 2 (10-1) + 2
= 2 (9) + 2
= 18 + 2
= 20
U100 = 2 (100-1) + 2
= 2 (99) + 2
= 198 + 2
= 200