Verbal Reasoning

Topic: Series completion

In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. 	_ stt _ tt _ tts _
A.	tsts	
B.	ttst
C.	sstt	
D.	tsst

Answer: Option D

Explanation:
The series is tst/tst/tst/tst. Thus, the pattern 'tst' is repeated.

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