Interview Q&A / Data Science
Data Science interview questions
Statistics, pandas, cleaning data and exploratory analysis for analyst and data science roles.
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- What is the difference between permutations and combinations?
Permutations count arrangements where order matters; combinations count selections where order does not. Choosing r from n gives nPr = n!/(n-r)! ordered ways and nCr = n!/(r!(n-r)!) unordered ways.
BeginnerQuick answer1 min read