Answer:
This is a MATLAB code.
clear all
clc
alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789';
for i = 1:combntns(length(alphabet),3) %takes the combination of (36,3)
pick(1) = ceil(rand()*length(alphabet)); %randomly chooses a letter or number
alphabet(find(alphabet == pick(1))) = ''; %removes the chosen character from the list
pick(2) = ceil(rand()*length(alphabet)); %randomly chooses second letter or number
alphabet(find(alphabet == pick(2))) = ''; %removes the chosen character
pick(3) = ceil(rand()*length(alphabet)); %randomly chooses the third letter or number
result(i,:) = alphabet(pick); %saves the 3-character pick into an array
alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789'; %restores the original list of letters and numbers
end
disp(result) %displays all the combinations
Explanation: Please read the comments on each line.
