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b= U2-U1 = 7-2 = 5 (b:beda anatra suku kedua dan pertama atau suku ketiga dengan kedua dst)
U8= a + (n-1)b
= 2 + (8-1)5
= 2 + 35
= 37
a=u1
b=7-2=5
u8=a+(n-1)b
=2+(8-1)5
=2+40-5
u8 = 37