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Un=a+bn-b
a.)
10,12,14,16,...
a=10, b=12-10=2
Un=10+2n-2
Un=2n+8
b.)
3, 5, 7, 9. . .
a=3, b=5-3=2
Un=3+2n-2
Un=2n+1
c.)
2, 4, 6, 8 . . .
a=2, b=4-2=2
Un=2+2n-2
Un=2n
d.)
2, 8, 14, 20 . . .
a=2, b=8-2=6
Un=2+6n-6
Un=6n-4