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18=a+4b
U8=a+7b
30 = a+7b
a+7b=30
a+4b=18
------------- (-)
3b = 12
b= 4
a+4b= 18
a+16= 18
a= 2
S36 = 18(2a+(n-1) b
=18(4+140)
=2592