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u2= a+b = a+6
u6= a+(5×6)= a+30
u2:u6 = 3:5 = (a+6):(a+30)
3a+90=5a+30
60=2a
a=30 = u1
u2=30+6 = 36
un= a+(n-1)b
un= 30+6n-6=6n+24=84
6n=60
n=10
s10 = 1÷2 10 (a+Un) = 5 (30+84)
5+114=570 kursi (C)