Question
Wed October 12, 2011 By:

what is da diff bw (an) nd (n)? in the video term 571 hd 2 b checked if t was a term.so why did u take (an) as 571 and nt 9n)

Expert Reply
Thu October 13, 2011
In an AP, an generally denotes the nth term and n denotes the number of terms.
 
In the example discussed in the video, the question is to find whether 571 is a term of the given AP.
For that we are just saying that suppose 571 is the nth term of the AP. And, we know that the nth term is denoted by an.
So, 571 = an
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