Numbers one to ten are written on identical slips of paper. All of the slips of paper are placed in a bag.
What is the theoretical probability of picking a slip of paper that has a multiple of four on it?
you have the numbers 1-10 right? and the multiples of 4 that fit in this interval are 4 and 8. By that, you have 2 numbers out of the 10 that could be the answer, so 2/10 or 1/5 or 0.2%