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U3=a+2b=36 dieliminasi dengan
U7=a+6b=24 sama dengan b=-3
*a+2b=36
a+ (-6)=36
a=42
Sn=½n (2a+(n-1)b)
S30=½30(2.42+29.-3)
S30= 15.-3
S30=-45
haha capek