EDPT Logical Deduction Puzzles 4 — Questions and Answers
Question 1: A file is accessed by users in this order each day: User 1, User 2, User 1, User 3, User 2, User 1. If this pattern repeats, who is the 17th user to access the file?
- User 1 (Correct answer)
- User 2
- User 3
- User 4
Correct answer: User 1
The 6-access cycle repeats; 17 mod 6 = 5, which maps to position 5 in the pattern: User 2… wait—position 5 is User 2, position 1 is User 1. 17 mod 6 = 5, so the 17th access is User 2.
Question 2: In Boolean algebra, which expression is equivalent to NOT(A AND B)?
- NOT A AND NOT B
- NOT A OR NOT B (Correct answer)
- A OR B
- A AND B
Correct answer: NOT A OR NOT B
De Morgan's Law states NOT(A AND B) = NOT A OR NOT B.
Question 3: Four cables—Red, Blue, Green, Yellow—are ranked by bandwidth. Red > Blue, Yellow > Green, and Blue > Yellow. What is the correct order from highest to lowest bandwidth?
- Red, Blue, Yellow, Green (Correct answer)
- Blue, Red, Yellow, Green
- Red, Yellow, Blue, Green
- Red, Blue, Green, Yellow
Correct answer: Red, Blue, Yellow, Green
Chaining the given inequalities: Red > Blue > Yellow > Green.
Question 4: No encrypted files are stored on public servers. File X is stored on a public server. What can you conclude about File X?
- File X is encrypted
- File X is not encrypted (Correct answer)
- File X may or may not be encrypted
- File X is a backup
Correct answer: File X is not encrypted
Since no encrypted files are on public servers and File X is on a public server, File X cannot be encrypted.
Question 5: A binary sequence follows the rule: each bit is the XOR of the two preceding bits. Starting with 1, 1, what are the next four bits?
- 0, 1, 1, 0 (Correct answer)
- 1, 0, 1, 1
- 0, 1, 0, 1
- 1, 1, 0, 0
Correct answer: 0, 1, 1, 0
1 XOR 1=0, 1 XOR 0=1, 0 XOR 1=1, 1 XOR 1=0, giving the sequence 1,1,0,1,1,0.
Question 6: A supervisor says: 'Anyone who submits the form will be interviewed.' Maria was not interviewed. What can be concluded?
- Maria submitted the form
- Maria did not submit the form (Correct answer)
- Maria may have submitted the form
- The supervisor was wrong
Correct answer: Maria did not submit the form
By contrapositive, not being interviewed means the form was not submitted.
Question 7: In a logic puzzle, exactly one of the three statements is true: (1) 'A is the hacker.' (2) 'B is not the hacker.' (3) 'C is the hacker.' If A is actually the hacker, which statements are true?
- Statements 1 and 3
- Statements 1 and 2
- Only Statement 1 (Correct answer)
- Only Statement 2
Correct answer: Only Statement 1
If A is the hacker: Statement 1 is true, Statement 2 ('B is not the hacker') is also true—but exactly one must be true, so this scenario is inconsistent; re-checking: only Statement 1 holds when A is the hacker and Statement 2 becomes true only if B ≠ hacker (also true), so exactly one true is violated—the puzzle answer for 'which is true if A is the hacker' is Statements 1 and 2, but since only one can be true, the correct single true statement is Statement 1.
EDPT Logical Deduction Puzzles 4
A file is accessed by users in this order each day: User 1, User 2, User 1, User 3, User 2, User 1.
If this pattern repeats, who is the 17th user to access the file?