students are given a list of 10 vocbulary words to learn. in how many ways could four of the wwords be listed on the test? if wrong give correct answers please my answer is 3780.

Answer 1

permutations of 4 of ten (if the order of the 4 on the sheet matters)
n!/(n-r)! = 10!/6! =10*9*8*7 = 5040

Now if all you care about is the different groups of 4 and not what order on the sheet, you want the combinations of 4 of ten
n!/[r!(n-r)!] = permutations/r!
=5040 /4*3*2 = 210