What does “Arithmetic progression” actually mean in Sequences & Series, and why does it matter for JEE?
a sequence with a constant common difference d; the nth term is a+(n−1)d.
In simple words: a sequence with a constant common difference d; the nth term is a+(n−1)d. Getting Arithmetic progression clear matters because JEE questions on Sequences & Series usually test this idea directly, not just a formula you memorised.
Key point
Arithmetic progression
Common mistake
using the wrong count (n vs n−1) for the nth term.
Memory tip
the first term uses n=1, so the (n−1) accounts for the steps taken.
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