In the series POQ, SRT, VUW, ? The blank space refers to

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Q: 133 (IAS/1997)
In the series POQ, SRT, VUW, ? The blank space refers to

question_subject: 

Logic/Reasoning

question_exam: 

IAS

stats: 

0,11,2,0,1,11,1

keywords: 

{'blank space': [0, 1, 0, 1], 'series poq': [0, 1, 0, 0], 'vuw': [0, 1, 0, 0], 'srt': [0, 1, 0, 0], 'yxz': [0, 1, 0, 0], 'xzy': [0, 1, 0, 0], 'xyz': [0, 1, 0, 0], 'yzx': [0, 1, 0, 0]}

Each series is made up of increasing consecutive letters. The construction of the series follows a pattern where each letter is two places ahead of the previous one. For example, `P` is followed by `Q` which is one letter ahead and `O` is sandwiched between them. In similar pattern, `S` is followed by `T` and `R` is in between them, and `V` is followed by `W` with `U` in between. Following this pattern, after `V`, `W`, `X` should come, then `Y` and between `X` and `Y`, `Z` should be sandwiched. Hence, the correct answer is `YXZ` (option 3) and not others. Option 1, 2 and 4 are incorrect as they do not follow the pattern of the given series.