Repeats allowedNo Repeats Permutations (order matters): nr n!(n − r)! Combinations (order doesn't matter): (r + n − 1)!r!(n − 1)! n!r!(n − r)!Mathopolis:Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Activity: Subsets
How many different permutations of the letters in the word probability are there? What is the probability that you will get a 3-digit combination correct on the first guess if no digits in the combination can be repeated? How to solve permutations and combinations with a calculator What is a...