If the sum of n terms of an A.P. is 2n2 + 5n then its nth term is
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2
as
an = a +(n-1)
apply this formula....... whatever the question is
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It is given in the question,
Sn = 2n^2 + 5n
S1 = 2.1^2 + 5.1 = 7
hence, a1 = 7
Sn = 2.2^2 + 5.2 = 18
so,a1 + a2 = 18
=> a2 = 11
Common difference, d = 11 - 7 = 4
an = a + (n - 1) d
=7 + (n - 1) 4
= 4n + 3
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