9.Oblicz sumę ciągu arytmetycznego jeżeli:
r = 2
sn = (3+(n-1))*n = (n+2)*n
bo sn = (2a1+(n-1)*r)/2*n
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r = 2
sn = (3+(n-1))*n = (n+2)*n
bo sn = (2a1+(n-1)*r)/2*n