**Exercise 6.2**

Permutations and combinations

**Question and Answers**

**Class 11 – Maths**

Permutations and combinations

Class | Class 11 |

Subject | Mathematics |

Chapter Name | Permutations and Combinations |

Chapter No. | Chapter 6 |

Exercise | Exercise 6.2 |

Category | Class 11 Maths NCERT Solutions |

**Question 1 Evaluate **

**(i) 8 !**

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

**(ii) 4 ! – 3 !**

**(ii)** 4! = 1×2×3×4 = 24

3!=1×2×3 = 6

Therefore , 4! – 3! = 24 – 6 = 18

**Question 2 Is 3 ! + 4 ! = 7 ! ?**

**Answer **3!=1×2×3 = 6

4! = 1×2×3×4 = 24

3! + 4! = 6 +24 =30

7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040

Therefore, LHS ≠ RHS

**Question 3 Compute**

**Answer 3 **

**Question 4 FInd x , if**

**Answer **

**Question 5 Evaluate**

**(i) When n = 6, r = 2**

=30

**(ii) When n = 9, r = 5**

= 9×8×7×6×5 = 15120

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