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a10=a6+4r
4=20+4r
4r=4-20
r=-16/4=-4
a6=a1+5r
20=a1+5*(-4)
a1=20+20=40
an=a1+(n-1)r
an=40+(n-1)*(-4)
an=40-4n+4
an=-4n+44
2]
a4=a1+3r
6=-4+3r
3r=6+4
r=10/3= 3 i 1/3 = róznica
an=-4+(n-1)*10/3
an=-4+10/3 n-10/3
an=10/3 n- 22/3