I have lots of problems while solving AP. I get confused ? that which

1.	I have lots of problems while solving AP. I get confused ? that which is\' n\' and which is an
Answer» Thanks you ☺ N=no.of termsan=last term Sn= sum of termsD=common difference ? \'n \' means number of terms in a series and \'an\' is the specification to a particular nth term. Also an can be considered as last term having n terms.Example : please come ahead the fourth student from of the line having 12 students. In this question n=12 ( total number of students)an =a4 that mean 4th student.

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