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15-02-2017
Mathematics

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A bag contains marbles numbered 1 through 100. Zoe draws a marble. Then, without replacing the marble, she draws a second marble. If the first marble that she drew was numbered 5, what is the probability that the second marble drawn is a number from 1 to 10?

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oliviakaec oliviakaec

15-02-2017

If starting out, there are 100 marbles and Zoe pulls out a 5 and doesn't replace it, then there are 99 marbles left to choose from. So, there are 9 digits 1-10 (not including #5) making the proportion you have left 9/99 which simplifies to 1/11

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