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U10=a+9b = 37
U7 = a+6b = 25
---------------- -
3b = 12
b = 4
substitusikan b :
a+6b = 25
a+6(4)=25
a+24=25
a=1
S11 = (n/2) (2a+(n-1)b)
s11 = (11/2) ( 2+ (10x4)
s11 = (11/2) (42)
s11= 231