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S/n =n/2[A+D] A=6 D=46 8/2 [6+46] 4[52] 208
T12 =s=n/2 [2a+(n-1)d a=2 d=5-2=3 S=12/2[2*2+(12-1)3] [4+11*3] [6*37] = 222
T15=a+14d =5+14(-3) =5+-42 =-37
