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U 7 =a+6b=103
------------------------- -
3b=-15
b=-5
a+6b=103
a=103-6b
a=103-6(-5)
a=103+30
a=133
Sn=n/2(2a+(n-1)b)
S24=24/2(2×133+(24-1)-5)
S24=12(266-115)
S24=12(151)
S24=1812