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U3= a+2b= 18
-------------------- -
4b= 20
b= 5
a+2(5)= 18
a+10 = 18
a= 18-10= 8
Sn= n/2{2a+(n-1)b}
S24= 24/2{2.8+(24-1)5}
S24= 12{16+115}
S24= 1572
jadi jawabannya c