一对年轻夫妇和其两岁的孩子做游戏,让孩子把分别写有“One”,“World”,“One”,“Dream”的四张卡片随机排成一行,若卡片从左到右的顺序排成“One World One Dream”,则孩子会得到父母的奖励,那么孩子受到奖励的概率为______.
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