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Ever wondered how much difference one extra digit can make? If you use each of four digits only once, the math says you have 4 factorial: that’s 4 × 3 × 2 × 1 = 24 possible passcodes. But if the keypad allows repeats and the code is five digits long (with 4 numbers to choose from), the math changes to 4⁵ = 1,024 combinations. That’s about 43 times more possibilities, meaning one tiny change in the rules makes your code massively harder to guess. #maths #math #science #facts #learning | vt.physic