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For this type of problem, order doesn't matter in which you select the number of people out of the certain group. We use combination to solve the problem.

Some notes to know what is going on with this problem:

• You want to form a committee of 2 teachers and 5 students to be formed from 7 teachers and 25 students • Then, you select 2 teachers out of 7 without repetition and without considering about the orders of the teachers.

• Similarly, you select 5 students out out 25 without repetition and without considering about the orders of the students.

Therefore, the solution is (25 choose 5)(7 choose 2) ways, which is equivalent to 1115730 ways to form such committee!

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