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24-4n≥0
n≤6
an=24/n - 4n/n
an=24/n-4
Mamy do wyboru dodatnie dzielniki 24 i nie wieksze od 6.
a1=24-4=20
a2=12-4=8
a3=8-4=4
a4=6-4=2
a6=4-4=0
Odp. 5 wyrazow.
2.
a_{n+1}=4(n+1)+3=4n+4+3=4n+7
a_{n+1}-an=4n+7-(4n+3)=4n+7-4n-3=4
r=4
ciag arytmetyczny