For students are randomly selected from a class of 25 to answer questions from reading assignment.

Question

In how many ways the four be selected if order does not matter?

25C4 = 12,650

In how many ways can the four be selected if they are assigned a particular passage to read?

25P4= 30,3600

am i correct? thank you

Answer 1

looks good to me, except for the misplaced comma