On a time crunch!!

Which of the following problems must be determined using a combination? Determine how many ways 20 people can line up at the front of a class. Determine the number of ways selecting a committee of size 4 when selected from a class of 25 students. Determine the probability of rolling a sum greater than 7 with a pair of dice. Determine the number of ways a President, Vice-President, and Secretary can be chosen from a class of 20 students. Question 3 (1 point) Suppose a committee of 2 men and 4 women are to be selected from a group of 12 men and 15 women. How many ways can this committee be formed? 1,440 4,324,320 90,090 180