संख्याओं के निम्नलिखित समूह में से विषम संख्या का चयन कीजिए: 13, 23, 43, 53, 63, 73, 83

Three out of four given options are alike in some manner and one is different. Choose the odd one out.

Three out of four letter-clusters are similar in a certain manner and one is different. Select the odd one out.