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(12-6)b = 36
b = 6
S40 = u6 + u12 + 23b= 24+60+23(6)= 222
U12 = a+11b = 60
eliminasi 2 persamaan diatas sehingga ditemukan b = 6 dan a= -6 sehingga S40 tinggakl gunakan rumus Sn=n/2(a+Un) jd S40 = 20(-6 + -6 +39(6))
= 222 ada nggak