a_n = 2n-5
Z def. ciągu arytmetycznego:
r = a_n+1 - a_n
2(n+1)-5 - (2n-5) = 2n+2-5 -2n+5 = 2 = r
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a_n = 2n-5
Z def. ciągu arytmetycznego:
r = a_n+1 - a_n
2(n+1)-5 - (2n-5) = 2n+2-5 -2n+5 = 2 = r