May 2023 1 5 Report
Dany jest ciąg arytmetyczny (an) w którym a4=13 а6=21 wtedy
A. a₁ = 9 r = 4
B a₁=1, r= 4
C. a₁ = 1 r = - 4
D. a₁= 5₁ r= 2​

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