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r roznica ciagu
a4=a1+[4-1]xr a10=a1+9xr
7=a1+3xr a10=7-3xr+9xr
a1=7-3xr a10=7+6xr
115={7-3xr+7+6xr}x5
115/5=[14+3xr]
23=14+3xr
23-14=3xr
9=3xr
r=3 a1=7-3x3=7-9=-2
ogolny wzor to an=a1+[n-1]xr an=-2+[n-1]x3
an=-2+3n-3
an=3n-5