October 2018 1 74 Report

Ktory z ponizszych ciagow jest ciagiem arytmetycznym?

A.

a_{n}=\frac{2}{n}+1

B.

b_{n}=n^{2}-9

C.

c_{n}=(\frac{4}{5})^n

D.

d_{n}=(2n+3)^2 - 4n^2


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