How to make teams using math.random() in javascript?

I want to make a Javascript function which will take 3 inputs: Starting Number, Ending Number and Number of Teams.

When the user enters the data and hits enter, A HTML table will be displayed which will make teams based on Size Of Team between the Beginning and End numbers.

var Beg;  //input for starting number
Var End;  // input for ending number
var no_of_teams; //input for number of teams


 Math.floor((Math.random() * End) + Beg);

What code should I write to make a HTML table out of the the math.random numbers.

Eg:

User enters

Beg : 43

End : 63

no_of_teams : 5

The Output will be :

Team 1: 54,52,63,43

Team 2: 58,61,49,60

Team 3: 51,52,53,55

Team 4: 49,59,47,44

Team 5: 56,57,45,46