On an exam, a student is to select any 4 out of 9 problems. All of the problems are of equal difficulty. The examination contains 1 geometry, 3 logic, 1 calculation and 4 probability problems.
A) How many 4 problem selections could be made ?
B) How many of the selections in "a" will contain 1 logic, 1 calculation and 2 probability problems ?
C) What is the probability that a 4 problem selection contains 1 logic, 1 calculation, and 2 probability problems?
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