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The nth term of an ap is 2n + 1 then the sum of n terms of an ap is

Posted by Mahak Gartan 6 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Aviral Goyal 6 years, 3 months ago

n(n+2)

0Thank You

Prachi Janwani 6 years, 3 months ago

An= 2n+1 If n=1, than A1(first term of AP)= 2×1+1=3 A2= 2×2+1= 5 From A1 and A2 we can get common difference=5-3=2 Sum of n terms =(n/2)[2a+(n-1)d] =(n/2)[2×3+(n-1)2] =(n/2)[6+2n-2] =(n/2)[4+2n] =(n/2)×2[2+n] =n(2+n) =n^2+2n

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CBSE > Class 10 > Mathematics