Geometry

Question Analysis
This question combines the concept of combinations with probability.
The main focus is on using the combination formula to calculate the number of favorable combinations (drawing exactly 2 red balls) and the total number of combinations (drawing 4 balls from all the balls), and then using the probability formula .

Key Concept Explanation
The combination formula is used to find the number of ways to select a certain number of items from a set.
The probability formula for an event is , where the number of outcomes is calculated using combinations.

Step - by - Step Solution
Total number of balls
Total number of ways to draw 4 balls out of 12:

Click "Show Answer" to reveal the answer and analysis