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/

Go Ad-free
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo