Camille K.

asked • 07/17/21

Algebra 2 Problem, Combinations/Permutations

I'm having trouble figuring out how to start this problem, and why my answer is always incorrect. I keep getting 435, but I am marked wrong. Please help! Here's the problem:


In an economics class with 30 students, the teacher wants 2 different students to answer problems 4 and 9 in front of the class. In how many ways can the teacher pick students for the problems?

a. 870

b. 435

c. 560

d. 660

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