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Questions  >>  Olympiad-Math  >>  Class 10
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Q)

If the sum of $n$ terms of an A.P. is given by $S_n=3n^2-n$,then its common difference $'d'$ is ________

$\begin{array}{1 1}(A) \; 5\\(B)\;-5 \\(C)\;6 \\(D)\;-6 \end{array}$

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