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b=u2-u1
=6-3
=3
dit:suku ke 11
jwb= pertama un=a+(n-1)b
un=3+(n-1)3
un=3+3n-3
un=3n
kedua un=3n
u11=3n
u=3(11)
u=33
jadi,suku ke 11 adalah 33
maaf kalau salah