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A committee of 4 is to be formed from 6 grade 9 students, 5 grade 10 students, 3 grade 11 students and 2 grade 12

A committee of 4 is to be formed from 6 grade 9 students, 5 grade 10 students, 3 grade 11 students and 2 grade 12 students.

1) What is the probability that the committee has one student from every grade?

2) What is the probability that the committee has AT MOST 2 grade 9 students?

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