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u14= 3+(14-1)3
= 3+39
u14= 42
2.) un = a+(n-1)b
u14= -10 + (14-1)1/2
= -10 +6,5
u14= -3.5
un=a+(n-1)b
u14=a+13b
u14=3+13(3)
u14=3+39
u14=42
2.
u14=a+13b
u14=-10+13(1/2)
u14=-10+13/2
u14=-7/2=-3,5