Introduction:
Sequences and series are important topics in the mathematics section of the JEE Main exam. These questions require a good understanding of the concepts and the ability to apply them in problem-solving. Here are some strategies to approach and solve questions related to sequences and series in the JEE Main exam.

1. Understand the Basics:
Before attempting any sequence and series questions, it is important to have a clear understanding of the basic concepts. Make sure you are familiar with terms like arithmetic progression (AP), geometric progression (GP), arithmetic mean (AM), geometric mean (GM), and common difference (d) or common ratio (r).

2. Identify the Type of Sequence:
There are different types of sequences like AP, GP, and harmonic progression (HP). It is crucial to identify the type of sequence given in the question. Look for patterns or relationships between the terms to determine the type.

3. Find the General Term:
Once you have identified the type of sequence, the next step is to find the general term (nth term) of the sequence. For AP, the general term is given by an = a1 + (n-1)d, where a1 is the first term and d is the common difference. For GP, the general term is given by an = a1 * r^(n-1), where a1 is the first term and r is the common ratio.

4. Apply Sum Formulas:
Questions related to the sum of terms in a sequence often require the use of sum formulas. For AP, the sum of the first n terms (Sn) is given by Sn = (n/2)(2a1 + (n-1)d). For GP, the sum of the first n terms (Sn) is given by Sn = (a1 * (1 - r^n))/(1 - r). Memorize these formulas and practice applying them to different problems.

5. Look for Patterns:
In some cases, questions may not directly ask for the sum of terms but require finding a specific pattern or relationship between the terms. Analyze the given sequence and try to identify any patterns or recurring themes. This can help in solving the problem more efficiently.

6. Practice Time Management:
Time management is crucial in the JEE Main exam. To solve sequence and series questions effectively, practice solving them within a limited time frame. This will help improve your speed and accuracy during the actual exam.

Conclusion:
To excel in the sequence and series questions, it is essential to have a strong foundation of the basic concepts, identify the type of sequence, find the general term and apply the relevant sum formulas. Regular practice and time management are key to solving these questions effectively in the JEE Main exam.