var val = 0;
$("#heiheihei").click(function () {
var arr = ["10", "20", "30", "40", "50"];
for(var i=0; i<arr.length; i++) {
if(arr[i] == val) {
arr.splice(i, 1);
break;
}
}
n = Math.floor(Math.random()*arr.length);
val = arr[n];
$("#box").html(arr[n]);
});

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