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b=1/6
s11= 11/2(2*1/3+(11-1)1/6)
s11=11/2(2/3+5/3)
s11=11/2(7/3)
s11=77/6
b. 0+a+2a+3a+...
b=a
s17=17/2(2*0+(17-1)a)
s17=17/2(16a)
s17=136a