NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2 are part of NCERT Solutions for Class 11 Maths. Here we have given NCERT Solutions for Class 11 Maths Chapter 7 Permutations and Combinations Ex 7.2.

- Permutations and Combinations Class 11 Ex 7.1
- Permutations and Combinations Class 11 Ex 7.3
- Permutations and Combinations Class 11 Ex 7.4

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 11 |

Subject |
Maths |

Chapter |
Chapter 7 |

Chapter Name |
Permutations and Combinations |

Exercise |
Ex 7.2 |

Number of Questions Solved |
5 |

Category |
NCERT Solutions |

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

**Question 1.**

Evaluate

(i) 8!

(ii) 4!-3!

**Solution.**

**(i)** 8! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320

**(ii)** 4! – 3! = (1 x 2 x 3 x 4) – (1 x 2 x 3) = 24 – 6 = 18

**Question 2.**

Is 3! + 4! = 7! ?

**Solution.**

3! + 4! = (1 x 2 x 3) + (1 x 2 x 3 x 4) = 6 + 24 = 30 … (i)

7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040 ………(ii)

From (i) & (ii), we get 3! + 4! ≠ 7!.

**Question 3.**

**Solution.**

**Question 4.**

, findx.

**Solution.**

We have,

**Question 5.**

Evaluate , when

(i) n = 6, r = 2

(ii) n = 9, r = 5

**Solution.**

**(i)**

**(ii)**

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