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Follow the Trail

Perhaps you're wondering how I was able to do that without receiving any information from you at all. The answer's simple: no matter what number you choose, you'll get the same result. How is that possible? Let's walk through this again, but this time, don't actually pick a number. Choose "X" instead.

For your convenience, below the instructions, I've written out the entire mathematical expression. Watch what happens.

 

Pick a number between 1 - 15.

X