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//You should make an array:

var words = ['Rock', 'Paper', 'Scissors'];
//and then generate a random number between 0 and the length of the array, with 0 decimals:

var number = Math.floor(Math.random() * words.length);
//And then select the word where the key is the random nummer you just created:

var word = words[number];
//In total:

var words = ['Rock', 'Paper', 'Scissors'];
var word = words[Math.floor(Math.random() * words.length - 1)];