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U3 = a+(3-1)b =a+(3-1)b = a+2b = 18 -
4b = 20
maka b = 20/4 = 5
utk cari a= a+(3-1)5 = a+10 = 18. maka a=18-10=8
maka jumlah hinggu suku ke 24 adalah
24/2(2(8)+(24-1)5
12(16+(23x5)
12(16+115)
12(131)
1572