If the first term of an Arithmetic sequence is (n) and common differen

1.	If the first term of an Arithmetic sequence is (n) and common difference is 2n . then prove that the sum of first n terms is
Answer» ONG>Step-by-step EXPLANATION: a=n , c.d = 2n , term = n sn = n/2{2n+(n-1)2n} =n/2(2n+2nsquare- 2n) =n/2•2nsquare answer is n CUBE

If the first term of an Arithmetic sequence is (n) and common difference is 2n . then prove that the sum of first n terms is

Answer» ONG>Step-by-step EXPLANATION:

a=n , c.d = 2n , term = n

sn = n/2{2n+(n-1)2n}

=n/2(2n+2nsquare- 2n)

=n/2•2nsquare

answer is n CUBE

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If the first term of an Arithmetic sequence is (n) and common difference is 2n . then prove that the sum of first n terms is ​

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If the first term of an Arithmetic sequence is (n) and common difference is 2n . then prove that the sum of first n terms is