W pewnym ciągu arytmetycznym
a3=1
a7=13
oblicz: s100
a7-a3=4r
13-1=4r
r=3
a1=-5
a100=a1+99xr=-5+99x3=292
S100=a1+an/2xn
S100=-5+292/2x100
S100=14350
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a7-a3=4r
13-1=4r
r=3
a1=-5
a100=a1+99xr=-5+99x3=292
S100=a1+an/2xn
S100=-5+292/2x100
S100=14350