A random draw is being designed for 210 participants. A single winner is to be chosen, and all the participants must have an equal probability of winning. If the winner is to be drawn using 10 balls numbered 0 through 9, how many balls need to be picked, regardless of order, so that each of the 210 participants can be assigned a unique set of numbers?

Question

anonymous · Answer

do i have to do K1! / K1-K2!

anonymous · Answer

the correct answer is 6 for future people, it said i was correct