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un= a (n-1)b
u6 = a+5b ==> 35=a+5b
u12 = a+11b ==> 65=a+11b
________ -
-30=-6b
b=5
35=a+5b
35=a+5(5)
a=35-25
a=10
un=10+(n-1)5
un=10+5n-5
un=5+5n
atau
un=5(1+n)