MHB How Should I Start My Probability Question to Get the Best Help?

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To receive the best help with probability questions, users should share their progress, including any work done or initial thoughts. This practice allows helpers to understand where the user is struggling and avoid suggesting solutions that have already been attempted. Providing context enhances the quality of assistance and saves time for both the user and the helper. Engaging with the community in this manner fosters more effective problem-solving. Sharing your progress is essential for optimal support in tackling probability challenges.
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Hello Marcus Cheng and welcome to MHB! :D

We ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This way our helpers can see where you are stuck or may be going astray and will be able to post the best help possible without potentially making a suggestion which you have already tried, which would waste your time and that of the helper.

Can you post what you have done so far?
 

Thread 'Two interesting number theory tricks'

First trick I learned this one a long time ago and have used it to entertain and amuse young kids. Ask your friend to write down a three-digit number without showing it to you. Then ask him or her to rearrange the digits to form a new three-digit number. After that, write whichever is the larger number above the other number, and then subtract the smaller from the larger, making sure that you don't see any of the numbers. Then ask the young "victim" to tell you any two of the digits of the...
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