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U14=56
Un=a+(n-1)b
U3=a+2b=12
U14=a+13b=56
eliminasi a:
a+2b=12
a+13b=56
_____________-
-11b=-44
b=4
substitusi b=4
a+2b=12
a+2(4)=12
a+8=12
a=4
U25=a+(n-1)b
=4+(25-1)4
=4+(24)4
=4+96
=100