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  1. Chapter 7 Class 11 Permutations and Combinations
  2. Serial order wise

Transcript

Example 8 If 1/8! + 1/9! = ( 𝑥 )/10! , find x . 1/8! + 1/9! = 𝑥/10! 10! (1/8! " + " 1/9!) = x 10!/8! + 10!/9! = x (10 × 9 × 8!)/8! + (10 × 9!)/9! = x 10 × 9 + 10 = x 90 + 10 = x 100 = x Hence, x = 100

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.