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U2=7=1+b;b=6
Un=a+(n-1)b
Un=1+(n-1)6=1-6+6n=5-5n atau Un=5-5n
U2=7=1+b;b=6
Un=a+(n-1)b
Un=1+(n-1)6=1-6+6n=5-5n atau Un=5-5n