Data Sufficiency — TV schedule over four consecutive days: on which day was serial C aired? Four serials A, B, C, D were screened one per day on four consecutive days (order unknown). Statements: I. The first serial was screened on 23rd (Tuesday) and was followed by serial D. II. Serial A was not screened on 25th, and exactly one serial was screened between A and B. Choose the correct sufficiency option.

Difficulty: Easy

Correct Answer: Neither I nor II is sufficient

Explanation:

Structure the days
Days: 23 Tue (Day1), 24 Wed (Day2), 25 Thu (Day3), 26 Fri (Day4).

Statement I
“First serial was on 23rd and was followed by D” ⇒ D on Day2 (24th). No placement for A, B, or C ⇒ insufficient.

Statement II
A not on 25th; A and B separated by exactly one day (patterns Day1&Day3 or Day2&Day4). No absolute anchor day ⇒ insufficient.

Together (note)
With D fixed on Day2 and A/B separation, we get A=Day1, B=Day3, so C=Day4. But neither statement alone suffices.

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