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A jar contains ten marbles (marked from 1 to 10). Four marbles are drawn without replacement, the number noted. Find the probability of: a. Smallest number is 5?. b. Biggest number is 5?

Should I take favorable cases as 1 to 5 and then to 10..how should I approach it.Please guide me.

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  • $\begingroup$ Welcome to MSE. Your question is phrased as an isolated problem, without any further information or context. This does not match many users' quality standards, so it may attract downvotes, or closed. To prevent that, please edit the question. This will help you recognise and resolve the issues. Concretely: please provide context, and include your work and thoughts on the problem. These changes can help in formulating more appropriate answers. $\endgroup$
    – José Carlos Santos
    Commented Mar 22, 2020 at 9:11
  • $\begingroup$ Please read about the order statistics: en.wikipedia.org/wiki/Order_statistic $\endgroup$
    – Semoi
    Commented Mar 22, 2020 at 9:19
  • $\begingroup$ How many ways are there to pick a sample of 4 numbers from 1 to 10 ? How many samples are there with numbers 1 - 5 out of which one is 5 ? $\endgroup$
    – brainfood
    Commented Mar 22, 2020 at 14:40

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so,you first draw a marble so what is the possibility that the number on it is 5-6(because we want more than 4).of course 2/6.so the probability of getting more than 4 is 2/6.the second marble has the same probability.so the answer will be (2/6)^4.

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