One-Shot Class 11 Maths NCERT Chapter 6 Exercise 6.2 Full Solutions | Permutations and Combinations

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In this video, we explain the complete solution of Exercise 6.2 (Permutations and Combinations) from Class 11th Maths Chapter 6 (NCERT 2025–26) with step-by-step solutions, clear explanations, and shortcut tricks.

On YouTube, no one has solved all 5 questions of Exercise 6.2, Chapter 6 – Permutations and Combinations (PNC) as fast as we have.
Through this video, you’ll get the fastest one-shot solution of all five questions of Exercise 6.2 (Chapter 6: Permutations and Combinations) — and you’ll spend less than 1 minute on each question!


You will also learn how to solve factorial-based problems, simplify permutation formulas, and understand how combinations relate to factorial expressions — all in a crystal-clear and logical way.


📚 Chapter Name: Permutations and Combinations
📘 Exercise: 6.2
🎯 Topics Covered:


🧮 Questions Covered (as given in NCERT):

Q1. Evaluate:
(i) 8!  
(ii) 4! – 3!

Q2. Is 3! + 4! = 7! ?

Q3. Compute:
8!/6!×2!

Q4. If
1/6! +1/7! = x/8!
find x.

Q5. Evaluate:
n!/(n−r)! when
(i) n = 6, r = 2  
(ii) n = 9, r = 5

• Evaluation of factorials (n!)

• Relationship between factorial terms

• Simplifying permutation ratios

• Solving equations involving factorials

• Step-by-step NCERT-based solutions

💡 This video helps you to:

👉Strengthen your understanding of factorials

👉 Prepare for exams (CBSE, State Boards, JEE Foundation)

👉 Build strong mathematical concepts

👉 Quick revision of entire exercise 6.2 class 11 not only your board exam but also for JEE mains exam.


⏱️ Timestamps – Exercise 6.2 (Class 11 Maths Chapter 6: Permutations & Combinations)

0:00 – Q1 Evaluate: (i) 8! (ii) 4! – 3!

0:42 – Q2 Is 3! + 4! = 7!?
1:48 – Q3 Compute 8! / (6! × 2!)

2:16 – Q4 If 1/6! + 1/7! = 1/x, find x

2:56 – Q5 Evaluate (n−r)! / n! when (i) n=6, r=2 (ii) n=9, r=5



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