a2=a1+d=17,
a6=a1+5d=65;
d=17-a1,
a1+5(17-a1)=65,
-4a1=-20,
a1=5,
S6=(a1+a6)6/2=(5+65)*3=210
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a2=a1+d=17,
a6=a1+5d=65;
d=17-a1,
a1+5(17-a1)=65,
-4a1=-20,
a1=5,
S6=(a1+a6)6/2=(5+65)*3=210