NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.2 are the part of NCERT Solutions for Class 11 Maths. Here you can find the NCERT Solutions for Class 11 Maths chapter 6 Permutations and Combinations Ex 6.2.
NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.2
Ex 6.2 Class 11 Maths Question 1.
Evaluate
(i) 8!
(ii) 4! – 3!
Solution.
(i) 8! = 1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 = 40320
(ii) 4! – 3! = (1 × 2 × 3 × 4) – (1 × 2 × 3) = 24 – 6 = 18
Ex 6.2 Class 11 Maths Question 2.
Is 3! + 4! = 7!?
Solution: We have, 3! = 1 × 2 × 3 = 6 … (1)
4! = 1 × 2 × 3 × 4 = 24 … (2)
Adding (1) and (2), we get
3! + 4! = 6 + 24 = 30
7! = 1 × 2 × 3 × 4 × 5 × 6 × 7 = 5040
Therefore, 3! + 4! ≠ 7!
Ex 6.2 Class 11 Maths Question 3.
Compute
Solution:
Ex 6.2 Class 11 Maths Question 4.
Solution:
Ex 6.2 Class 11 Maths Question-5
Solution:
