Combinations and Permutations Calculator - Math is Fun - Maths Resources
Example: how many ways can Alex, Betty, Carol and John be lined up, with John after Alex. Use: n=4, r=4, order=yes, replace=no. Alex, Betty, Carol, John pattern *,Alex,*,John The result is: {Alex,Betty,Carol,John} {Alex,Betty,John,Carol} {Alex,Carol,Betty...