1) a1=1, an=133, d=2
an=a1+(n-1)*d
133=1+(n-1)*2
132=2n-2, n=67
S67=((1+133)/2)*67=67*67=4489
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1) a1=1, an=133, d=2
an=a1+(n-1)*d
133=1+(n-1)*2
132=2n-2, n=67
S67=((1+133)/2)*67=67*67=4489