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Class 11
Maths :-NCERT Solutions - Permutations And Combinations.

Page No 140:
Question 1:
Evaluate
(i) 8! (ii) 4! – 3!


Answer:


(i) 8! = 1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 = 40320
(ii) 4! = 1 × 2 × 3 × 4 = 24
3! = 1 × 2 × 3 = 6
∴4! – 3! = 24 – 6 = 18


NCERT Maths Class 11

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