Probability of choosing overlapping numbers multiple times in multiple choice scenario











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There are 10 numbers to choose from, 1-10 inclusive, and every choice will be uniformly random without knowledge of the previous choices.



Two individuals are going to choose numbers and I'm trying to understand how to calculate the probability of overlapping choices. The first individual chooses 4 different numbers in one attempt, he can't pick the same number more than once, and the second individual choose only 1 number. This is repeated in 5 rounds. What is the probability that the the second individual chooses a different number from the 4 numbers chosen by the first individual for every round?



Would it make any difference if the first individual only changes his choice every other round e.g. round 1, 3, and 5 while the second individual makes a new choice every round?










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    up vote
    0
    down vote

    favorite












    There are 10 numbers to choose from, 1-10 inclusive, and every choice will be uniformly random without knowledge of the previous choices.



    Two individuals are going to choose numbers and I'm trying to understand how to calculate the probability of overlapping choices. The first individual chooses 4 different numbers in one attempt, he can't pick the same number more than once, and the second individual choose only 1 number. This is repeated in 5 rounds. What is the probability that the the second individual chooses a different number from the 4 numbers chosen by the first individual for every round?



    Would it make any difference if the first individual only changes his choice every other round e.g. round 1, 3, and 5 while the second individual makes a new choice every round?










    share|cite|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      There are 10 numbers to choose from, 1-10 inclusive, and every choice will be uniformly random without knowledge of the previous choices.



      Two individuals are going to choose numbers and I'm trying to understand how to calculate the probability of overlapping choices. The first individual chooses 4 different numbers in one attempt, he can't pick the same number more than once, and the second individual choose only 1 number. This is repeated in 5 rounds. What is the probability that the the second individual chooses a different number from the 4 numbers chosen by the first individual for every round?



      Would it make any difference if the first individual only changes his choice every other round e.g. round 1, 3, and 5 while the second individual makes a new choice every round?










      share|cite|improve this question













      There are 10 numbers to choose from, 1-10 inclusive, and every choice will be uniformly random without knowledge of the previous choices.



      Two individuals are going to choose numbers and I'm trying to understand how to calculate the probability of overlapping choices. The first individual chooses 4 different numbers in one attempt, he can't pick the same number more than once, and the second individual choose only 1 number. This is repeated in 5 rounds. What is the probability that the the second individual chooses a different number from the 4 numbers chosen by the first individual for every round?



      Would it make any difference if the first individual only changes his choice every other round e.g. round 1, 3, and 5 while the second individual makes a new choice every round?







      probability






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      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Nov 18 at 13:37









      Jimmy

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