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b=2
Un=a+(n-1)b
=3+(n-1)2
=3n+2n-2
=1+2n
2.) a=4
b=4
Un=a+(n-1)b
=4+(n-1)4
=4+4n-4
=4n
3.) a=10
b=-3
Un=a+(n-1)b
=10+(n-1)(-3)
=10+(-3n)(3)
=13-3n