Arrangements with Repetition: n^r and Computational Representation
·2642 words·13 mins
A 4-digit password allows repetition, and that is why there are 10,000 of them: ten options in each of the four positions. The arrangement with repetition counts passwords, license plates, and RGB colors, and shows how many patterns fit in the 32 bits of a float and in the registers of an HP-11C calculator.
