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Grade: 12th pass

                        

10. Activity: Ask all the students in your class to write a 3-digit number in order. Choose any student from the 238 room at random. What is the probability that the number written by her I him is diuisible by 3? Remember that a number is d iuisible by 3, if the sum of its d igits is diuisible by 3.

10. Activity: Ask all the students in your class to write a 3-digit number in order. Choose any student from the


238
room at random. What is the probability that the number written by her I him is diuisible by 3? Remember that a number is d iuisible by 3, if the sum of its d igits is diuisible by 3.

one month ago

Answers : (1)

Pawan Prajapati
askIITians Faculty
5328 Points
							We know that there is one number among three consecutive positive integers is divisible by 3. Hence, about one third of the students of the class would write the numbers divisible by 3. 
Hence, the required probability is .!:. . 
3 
Not.e: Here we are assuming number of students in class 
is a multiple of 3. 

						
one month ago
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