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dit: rumus suku ke-n
dij: suku ke = a =7
b = U2-U1 = 9-3=6
rumus suku ke-n
Un= a+(n-1)b
Un=3+(n-1)6
Un=3+3n-6
Un=3n+3-6
Un=3n+-3
semoga membantu hhe(: