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var result = [];
var ary = [1, 2, 3, 4, 5, 6 ,7, 8, 9 ,10];
while(true)
{
var random = parseInt((Math.random() *10));
if(!result.includes(ary[random]))
{
result.push(ary[random]);
}
if(result.length == 3)
{
break;
}
}
console.log(result);