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Geeta Kapoor
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Asked: 2020-11-04T09:58:26+00:00 In:

Activity : Ask all the students in your class to write a 3-digit number. Choose any student from the room at random. What is the probability that the number written by her/him is divisible by 3? Remember that a number is divisible by 3, if the sum of its digits is divisible by 3.

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NCERT Solutions for Class 9 Maths Chapter 15
Important NCERT Questions
Probability
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 15.1
Page No:285
Questions No:10

2020-2021cbsechapter 15class 9mathematicsncertprobability
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    2 Answers

    1. Get Hindi Medium and English Medium NCERT Solution for Class 9 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-15/

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    2. Best Answer

      Given 3- digit numbers = 100, 101, 102 … 999 and total number of 3-digit numbers = 999 – 99 = 900
      Numbers divisible by 3 = 102, 105, 108 … 999. So, the number of numbers divisible by 3 = 300
      Therefore,
      P(number divisible by 3) = 300/900 = 1/3
      Hence, the probability that the number written by her/him is divisible by 3 is 1/3.

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