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Chapter 7 क्रमचय और संचयं (Permutations and Combinations) Ex 7.2 Solutions

Question - 1 : -
मान निकालिए:
(i) 8!
(ii) 4! – 3!

Answer - 1 : -

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

Question - 2 : -
क्या 3! + 4! = 7!

Answer - 2 : -

बायाँ पक्ष = 3! + 4! = 3! + 4! = 3 x 2 x 1 + 4 x 3 x 2 x 1 = 6 + 24 = 30
दायाँ पक्ष = 7! = 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040
अत: 3! + 4! ≠ 7!

Question - 3 : -

Answer - 3 : -



Question - 4 : -

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Question - 5 : -

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