all files / math.js/lib/probability/ index.js

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module.exports = {
 
    random: function() {
        return Math.random();
    },
 
    randomElement: function(arr) {
        return arr[Math.floor(Math.random() * arr.length)];
    },
 
    factorial: function(n) {
        return n * (n-1);
    }
};