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U10=a+9b= 10-18=-8
2. A. a=1 b=5-1=4
U10=a+9b=1+36=37
S10=10/2(1+37) = 5(38) =190
B. a=8 b=3
U10=8+27=35
S10=10/2(8+35)=5(43) = 215