if a nth term of an ap is 2n + 1 what is the sum of its first three terms
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A=2(1)+1
a=3
2nd term= 2(2)+1
2nd term =5
D=2
3rd term= 7
Sum of the first three terms =3+5+7
=15
a=3
2nd term= 2(2)+1
2nd term =5
D=2
3rd term= 7
Sum of the first three terms =3+5+7
=15
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