Math, asked by manohar7061, 3 months ago

if the sum of 'n' term of an authematic progression is 3n^2+3n then common difference is​

Answers

Answered by yazh97
0

Step-by-step explanation:

Let S

n

be the sum of n terms of an AP with first term a and common difference d.

Since S

n

=3n

2

−n and d=6

⇒S

n

=

2

n

(2a+(n−1)d)=3n

2

−n

2

n

(2a+(n−1)6)=3n

2

−n

n(a+(n−1)3)=3n

2

−n

(a+3n−3)=3n−1

a=2

hope it is helpful dear friend

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