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a1=8km, r=2km, a
n=60
, n-?


Răspuns :

progresie aritmetica ⇒ an=a1+(n-1)r, 60=8+(n-1)2, 60=8+2n-2, 2n=60-8+2=54,

n=54/2=27 termeni are progresia