The
sum
of the
Ap
n terms
n²-n thin
will be
the
nth
term
Answers
Answered by
0
Step-by-step explanation:
Given: S
n
=n
2
+2n...(i)
S
n−1
=(n−1)
2
+2(n−1)=n
2
+1−2n+2n−2=n
2
−1...(ii)
Subtracting eq (ii) from (i), we get
t
n
=S
n
−S
n−1
=n
2
+2n−n
2
+1=2n+1
The n
th
term of an AP is 2n+1.
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