If Sn=27n-7n²/2 be the sum to first n term of an a.p, then write the common difference of the a.p

If Sn=27n-7n²/2 be the sum to first n term of an a.p, then write the

1.	If Sn=27n-7n²/2 be the sum to first n term of an a.p, then write the common difference of the a.p
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