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The questions in the image involve counting combinations:

1. **Question 2:** There is a box containing 7 red balls and 8 black balls. 6 balls are drawn, consisting of 2 red and 4 black balls. The task is to calculate the number of ways to choose these balls.
   
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In a box containing 7 red balls and 8 black balls, 6 balls are drawn, consisting of 2 red and 4 black balls. How many different ways can the balls be selected? Additionally, from a group of 8 students, 2 students are chosen to become the treasurer and secretary of the school cooperative. How many ways can they be chosen?

Learn how to calculate combinations and permutations to solve probability problems involving selection of items, such as choosing balls from a box and selecting students for specific roles. This problem is suitable for students in Grades 7-9 and provides clear explanations of combination and permutation formulas.

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