Question 5922 – UGC NET CS 2009-June-Paper-2
November 27, 2023Question 1719 – Image-Processing
November 27, 2023Question 3 – ISRO-2018
A class of 30 students occupy a classroom containing 5 rows of seats, with 8 seats in each row. If the students seat themselves at random, the probability that the sixth seat in the fifth row will be empty is
Correct Answer: C
Question 2 Explanation:
Step-1: Given, 5 rows with 8 seats in each row.
Total number of seats = 5*40
= 40 seats
Total number of students= 30
Step-2: Given constraint that, 6th seat in the fifth row is empty
When we are deleting 6th seat, 30 students have 39 choices of seats
Step-3: Total number of choices = 39C30
Total ways to choose = 40C30
Step-4: Final probability = 39C30 / 40C30
= 1/4
Total number of seats = 5*40
= 40 seats
Total number of students= 30
Step-2: Given constraint that, 6th seat in the fifth row is empty
When we are deleting 6th seat, 30 students have 39 choices of seats
Step-3: Total number of choices = 39C30
Total ways to choose = 40C30
Step-4: Final probability = 39C30 / 40C30
= 1/4
1/5
1/3
1/4
2/5
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