दिए गए संख्या-युग्मों में दूसरी संख्या पहली संख्या पर एक निश्चित गणितीय संक्रिया करके प्राप्त की जाती है। एक को छोड़कर सभी संख्या-युग्मों में समान संक्रिया का पालन किया जाता है। वह विषम संख्या-युग्म ज्ञात कीजिए।

Based on the alphabetical order, three of the following four are alike in a certain way and thus form a group. Which is the one that does not belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster)

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)