an=a+(n-1)d
420=3+(n-1)3
417=(n-1)3
(n-1)=139
n=140
Sn=n/2[2A+(n-1)d]
=70(6+417)
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an=a+(n-1)d
420=3+(n-1)3
417=(n-1)3
(n-1)=139
n=140
Sn=n/2[2A+(n-1)d]
=70(6+417)