Five subjects S1, S2, S3, S4, and S5, (not necessarily in the same order) are taught from Monday to Friday. One subject will be taught one day. Only S5 is taught before S1. S2 is taught before S4. S5 will not be taught Wednesday. Which of the following pairs of subjects is taught after S3?
Five subjects S1, S2, S3, S4, and S5, (not necessarily in the same order) are taught from Monday to Friday. One subject will be taught one day. Only S5 is taught before S1. S2 is taught before S4. S5 will not be taught Wednesday. Which of the following pairs of subjects is taught after S3?
Solution
Since only S5 comes before S1, exactly one subject precedes S1, so S5 is on Monday and S1 on Tuesday. S2, S3 and S4 occupy Wednesday to Friday with S2 before S4. Placing S3 on Wednesday leaves S2 and S4 after it.
Note: The clue about S5 avoiding Wednesday is redundant and the last three slots are not fully fixed; we have taken the arrangement S5, S1, S3, S2, S4, which alone matches an option.
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