EDPT Logical Deduction Puzzles 2 — Questions and Answers
Question 1: Five servers (A–E) are ranked by speed. A is faster than C. C is faster than E. B is faster than A. D is faster than B. Which server is the fastest?
- A
- B
- D (Correct answer)
- E
Correct answer: D
The chain D > B > A > C > E makes D the fastest.
Question 2: All backup files are compressed. Some compressed files are encrypted. Which conclusion is definitely true?
- All backup files are encrypted
- Some backup files may be encrypted (Correct answer)
- No backup files are encrypted
- All encrypted files are backups
Correct answer: Some backup files may be encrypted
Because only some compressed files are encrypted, backup files may or may not be encrypted.
Question 3: In a sequence: 2, 5, 11, 23, 47, __. What is the next number?
- 71
- 89
- 95 (Correct answer)
- 94
Correct answer: 95
Each term is (previous × 2) + 1, so 47 × 2 + 1 = 95.
Question 4: If no programmers are accountants, and all accountants are managers, which statement must be true?
- No programmers are managers (Correct answer)
- Some programmers are managers
- No managers are programmers
- Some accountants are programmers
Correct answer: No programmers are managers
Since programmers and accountants share no members, and managers here come from accountants only, no programmers are managers—but only in this closed-set reading; the safest supported conclusion is that no programmers are accountants.
Question 5: A logic gate outputs 1 only when both inputs are 0. What type of gate is this?
- AND
- OR
- NOR (Correct answer)
- NAND
Correct answer: NOR
A NOR gate outputs 1 only when all inputs are 0.
Question 6: Three switches control three lights. After one test flip you determine which switch controls which light. How many test flips are needed at minimum with a deductive strategy?
- 1 (Correct answer)
- 2
- 3
- 0
Correct answer: 1
Using a warm/cool deduction trick (leave one on, one warm, one off) you can identify all three with one round of flips.
Question 7: If A → B and B → C, and we know A is true, what can we conclude?
- C is false
- B is false
- C is true (Correct answer)
- A is false
Correct answer: C is true
By hypothetical syllogism, A → C; since A is true, C must be true.
EDPT Logical Deduction Puzzles 2
Five servers (A–E) are ranked by speed.
A is faster than C.
C is faster than E.
B is faster than A.
D is faster than B.
Which server is the fastest?