Question 3735 – Engineering-Mathematics
December 6, 2023UGC NET CS 2014 Dec-Paper-2
December 6, 2023UGC NET CS 2016 July- paper-2
| Question 4 |
There are three cards in a box. Both sides of one card are black, both sides of one card are red, and the third card has one black side and one red side. We pick a card at random and observe only one side.
What is the probability that the opposite side is the same colour as the one side we observed?
What is the probability that the opposite side is the same colour as the one side we observed?
| 3/4 | |
| 2/3 | |
| 1/2 | |
| 1⁄3 |
Question 4 Explanation:
Given data,
— 3 cards in a box
— 1 st card: Both sides of one card is black. The card having 2 sides. We can write it as BB.
— 2 nd card: Both sides of one card is red. The card having 2 sides. We can write it as RR.
— 3rd card: one black side and one red side. We can write it as BR.
Step-1: The probability that the opposite side is the same colour as the one side we observed is 2⁄3 because total number of cards are 3
— 3 cards in a box
— 1 st card: Both sides of one card is black. The card having 2 sides. We can write it as BB.
— 2 nd card: Both sides of one card is red. The card having 2 sides. We can write it as RR.
— 3rd card: one black side and one red side. We can write it as BR.
Step-1: The probability that the opposite side is the same colour as the one side we observed is 2⁄3 because total number of cards are 3
Correct Answer: B
Question 4 Explanation:
Given data,
— 3 cards in a box
— 1 st card: Both sides of one card is black. The card having 2 sides. We can write it as BB.
— 2 nd card: Both sides of one card is red. The card having 2 sides. We can write it as RR.
— 3rd card: one black side and one red side. We can write it as BR.
Step-1: The probability that the opposite side is the same colour as the one side we observed is 2⁄3 because total number of cards are 3
— 3 cards in a box
— 1 st card: Both sides of one card is black. The card having 2 sides. We can write it as BB.
— 2 nd card: Both sides of one card is red. The card having 2 sides. We can write it as RR.
— 3rd card: one black side and one red side. We can write it as BR.
Step-1: The probability that the opposite side is the same colour as the one side we observed is 2⁄3 because total number of cards are 3