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Geometry 8 Online
OpenStudy (anonymous):

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?

OpenStudy (anonymous):

4 balls

OpenStudy (anonymous):

10 C k = 210 for k=4

OpenStudy (anonymous):

the answer is 6 not 4 like the other dumbasses here say

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