Find the common difference of an AP whose sum of the first n terms is given by 3n2-n
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Step-by-step explanation:
Sn is the sum of first n terms of an A.P
\text{Given:}Given:
\bf\,S_n=3n^2-nSn=3n2−n
\text{put n=1, we get}put n=1, we get
S_1=3(1)^2-(1)S1=3(1)2−(1)
S_1=3-1S1=3−1
S_1=2S1=2
\text{Sum of 1 term of the A.P=2}Sum of 1 term of the A.P=2
\implies\text{First term}=2⟹First term=2
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