A =1 D=2 n =25 find sn
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since an=a+(n-1)d
so an = 1+(25-1)2
= 49
therefore,
Sn=25/2 (a+an)
= 625
so an = 1+(25-1)2
= 49
therefore,
Sn=25/2 (a+an)
= 625
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