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a=2
b=U2-U1=3
dit=un..?
= a+(n-1)b
=2+(n-1)3
=2+3n-3
=-1+3n
b).a=16
b=16
un=a+(n-1)b
=16+(n-1)16
=16+16n-16
=16n
a> Un = 2 + (n-1)3
> Un = 2 + 3n -3
b> Un = ar pangkat n-1
> Un = 16 x (2)pangkat n-1
c> Un = 35 + (n-1)(-4)
> Un = 35 - 4n + 4
b> Un = ar pangkat n-1
> Un = 108 x (3)pangkat n-1