NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2

NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2

NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2

NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2 are the part of NCERT Solutions for Class 11 Maths. Here you can find the NCERT Solutions for Class 11 Maths chapter 7 Permutations and Combinations Ex 7.2.


Ex 7.2 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 7.2 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 7.2 Class 11 Maths Question 3.

Compute

Solution:

Ex 7.2 Class 11 Maths Question 4.


Solution:

Ex 7.2 Class 11 Maths Question-5


Solution:

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