Find the an of A. P if Sn=n^2+n
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Step-by-step explanation:
Sn = n^2 + n
Let n be 1
S1= 1 +1 = 2 = a1
S2 = 4 +2 = 6
S2 - S1 = a2 (sn - s(n-1) = an)
6-2= 4
a2 = 4
a = 2
d = 2
an = 2+ (n-1)2
an = 2+ 2n-2
an = 2n
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