Each of O, P, Q, R, S, T and U has an exam on a different day of a week starting from Monday and ending on Sunday of the same week. S has an exam on Wednesday. R has an exam on one of the days after P and T has an exam on one of the days before Q. U has an exam immediately after O and S has an exam immediately before O. T has an exam on one of the days after U. How many people have an exam between S and Q?

Two

Four

Five

Three

APEDIA

NTPC Graduate Tier 1

2025 • 05 Jun, 2025 • Shift-3

Each of O, P, Q, R, S, T and U has an exam on a different day of a week starting from Monday and ending on Sunday of the same week. S has an exam on Wednesday. R has an exam on one of the days after P and T has an exam on one of the days before Q. U has an exam immediately after O and S has an exam immediately before O. T has an exam on one of the days after U. How many people have an exam between S and Q?

Correct Answer

Three

[Chronological Anchor Setup]: We establish a firm baseline structure: Monday to Sunday. The immediate anchor point provided is that S's exam is definitively loc......

💡 Analysis & Explanation

[Chronological Anchor Setup] ▼

We establish a firm baseline structure: Monday to Sunday. The immediate anchor point provided is that S's exam is definitively locked on Wednesday.

[Adjacency Chains] ▼

We are told 'S has an exam immediately before O', meaning O must fall on Thursday. Furthermore, 'U has an exam immediately after O', placing U definitively on Friday. The core sequence is now Wed(S) - Thu(O) - Fri(U).

[Late Week Placement] ▼

Next, 'T has an exam on one of the days after U'. Since U is Friday, T must be either Saturday or Sunday. We also know 'T has an exam on one of the days before Q'. The only way to fit T before Q in the remaining days is for T to be Saturday and Q to take the final spot on Sunday.

[Early Week Resolution] ▼

The remaining slots are Monday and Tuesday. The clue 'R has an exam on one of the days after P' dictates that P must be Monday and R must be Tuesday.

[Final Assessment] ▼

The entire week is mapped as: Mon(P), Tue(R), Wed(S), Thu(O), Fri(U), Sat(T), Sun(Q). The question queries the gap between S (Wed) and Q (Sun). The exams falling strictly in between are O(Thu), U(Fri), and T(Sat).

Conclusion ▼

Exactly three people take their exams between S and Q.

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