the question is: If you know that 4 of the 10 items on a true-false test are false, how many different ways could you select 4 items to mark as being false?
I think the answer is 10P4=10*9*8*7/4*3*2*1=5040/24=210 ways
I think the answer is 10P4=10*9*8*7/4*3*2*1=5040/24=210 ways