A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears

(i) a two-digit number

(ii) a perfect square number.

(iii) a number divisible by 5.

 

Answer

 

This question is exactly same as Ex 15.1, 18 of Chapter 12 Class 10 in the NCERT Book.

Please check the answer and video here

https://www.teachoo.com/1982/563/Ex-15.1--18---A-box-contains-90-discs-which-are-numbered/category/Ex-15.1/

  1. Class 10
  2. Solutions of Sample Papers for Class 10 Boards

About the Author

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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.