EDPT Logical Deduction Puzzles 3 — Questions and Answers
Question 1: A data center has 4 racks: W, X, Y, Z. W is older than X. X is older than Z. Y is newer than W but older than X. What is the order from oldest to newest?
- W, Y, X, Z (Correct answer)
- W, X, Y, Z
- Y, W, X, Z
- W, X, Z, Y
Correct answer: W, Y, X, Z
W > Y > X > Z gives oldest-to-newest order W, Y, X, Z.
Question 2: Every malware sample in the database is flagged. Some flagged files are quarantined. Therefore:
- All malware is quarantined
- Some malware might be quarantined (Correct answer)
- No malware is quarantined
- All quarantined files are malware
Correct answer: Some malware might be quarantined
Since only some flagged files are quarantined, malware (a subset of flagged) may or may not be quarantined.
Question 3: What comes next in the series: O, T, T, F, F, S, S, E, __?
- N (Correct answer)
- T
- O
- W
Correct answer: N
These are first letters of One, Two, Three, Four, Five, Six, Seven, Eight, Nine — so the next is N.
Question 4: Six tasks must complete in order: 1 before 3, 2 before 4, 3 before 5, 4 before 6, and 1 before 2. Which task can never be last?
- 5
- 6
- 3
- 1 (Correct answer)
Correct answer: 1
Task 1 must precede tasks 2, 3, 4, 5, and 6, so it can never be last.
Question 5: If the statement 'If the server is overloaded, alerts fire' is true, and no alerts have fired, what can you deduce?
- The server is overloaded
- The server is not overloaded (Correct answer)
- Alerts may still fire later
- The server might be overloaded
Correct answer: The server is not overloaded
By contrapositive, if no alerts fired then the server is not overloaded.
Question 6: Three programmers—Alice, Bob, Carol—each know exactly two of three languages: Java, Python, Ruby. Alice knows Java and Python. Bob knows Python and Ruby. Which language does Carol know along with Java?
- Java only
- Python
- Ruby (Correct answer)
- Both Python and Ruby
Correct answer: Ruby
Carol must know two languages; Java is one, and since Python is covered by Alice and Bob, the remaining pairing is Java and Ruby.
Question 7: A truth table for P XOR Q shows output 1 when:
- Both P and Q are 1
- Both P and Q are 0
- P and Q have different values (Correct answer)
- P and Q have the same value
Correct answer: P and Q have different values
XOR (exclusive OR) outputs 1 only when exactly one input is 1, i.e., the inputs differ.
EDPT Logical Deduction Puzzles 3
A data center has 4 racks: W, X, Y, Z.
W is older than X.
X is older than Z.
Y is newer than W but older than X.
What is the order from oldest to newest?