The Apple iPhone 18 Pro and 18 Pro Max have arrived, and their familiar outward appearance belies a major change to the main camera. For the first time, an iPhone features a variable aperture, and ...
Flip a coin. If it comes up heads, move $${1}$$ step to the right; if tails, move $${1}$$ step to the left. Repeat this many times. This "random way of walking" is called a "random walk (drunkard's ...
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