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Two Ones

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#44413
Fun:** (2.05)
Difficulty:*** (2.11)
Category:Probability
Submitted By:shenqiangAcn****!!

 

 

 



Which is more likely to happen?

1) Roll a fair die 4 times and get at least one 1;
2) Roll 2 fair dice 24 times and get at least one "double 1".



Answer

Rolling a fair die once and failing to get a 1 has probability 5/6, and rolling 2 fair dice 6 times and failing to get a double 1 has probability (35^36)^6, which is slightly larger than 5/6.

Therefore, if you do each of the above 4 times and still fail to get a 1, the latter has a larger probability, therefore, the latter has a smaller succeeding probability than the former.

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