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an = 3n - 2
an+1 = 3*( n+1) - 2 = 3n +3 - 2 = 3n + 1
an+1 - an = 3n +1 -( 3n - 2) = 1 + 2 = 3
r = 3.
Odp. Różnica tego ciągu arytmetycznego jest równa 3.