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b.7
c.7
maaf kalau salah
2) bertambah dengan 2--> ke -10 = 11 +(10-6)2= 19
3) pola nya = (1+0)+ (2+1), (3+2), (4+3),(5+4), (6+5)..
Pola ke n = (n+n-1) = 2n -1