Plzz tell all formula of AP and when we use these formula

1.	Plzz tell all formula of AP and when we use these formula
Answer» I know formula but when what formula used plz tell When u have to find tn then tn=a+(n-1)d Sn=n/2 (a+l)Where,a is first term of an APl=last term of an APd= common difference between second and first term Basic terms is used in A. P 1 a=first term2 d=common difference 3 formula of an= a+(n-1)d4 formula of sn=n/2(2a+(n-1)d) an=a+(n-1)ds=n/2[2a+(n-1)d]

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