If the term of an AP is 20 + 1, then the sum of first n terms of the AP is
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a
n
=2n+1
a
1
=2+1=3
a
2
=2⋅2+1=5
d=a
2
−a
1
=5−3=2
S
n
=
2
n
[2a+(n−1)d]
=
2
n
[6+(n−1)2]
=
2
n
[2n+4]
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