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b=selisih/beda
a. un=a+(n-1)b
u4=15+(4-1)7
=15+3.7
=15+21
=36
u9=15+8.7
=15+56
=71
b. un=a+(n-1)b
u16= -50+(16-1)3
= -50 + 15.3
= -50 + 45
= -5
u27= -50+26.3
= -50 + 78
= 28