GRT GRT Logical Reasoning 1 — Questions and Answers
Question 1: If all Bloops are Razzies, and all Razzies are Lazzies, which of the following must be true?
- All Bloops are Lazzies (Correct answer)
- All Lazzies are Bloops
- No Lazzies are Bloops
- Some Razzies are not Lazzies
Correct answer: All Bloops are Lazzies
By transitivity: if Bloops ⊆ Razzies and Razzies ⊆ Lazzies, then Bloops ⊆ Lazzies.
Question 2: What number comes next in the sequence: 3, 6, 12, 24, 48, ?
- 96 (Correct answer)
- 72
- 84
- 60
Correct answer: 96
Each term is doubled: 3×2=6, 6×2=12, 12×2=24, 24×2=48, 48×2=96.
Question 3: In a logic puzzle, P implies Q, and Q implies R. If R is false, what can be concluded?
- P is false (Correct answer)
- P is true
- Q is true
- Nothing can be concluded about P
Correct answer: P is false
By contrapositive: if R is false, then Q is false (since Q→R); if Q is false, then P is false (since P→Q).
Question 4: Four employees — Alice, Bob, Carol, and Dan — sit in a row. Alice is not next to Bob. Carol sits at one end. Dan sits next to Alice. Who can sit at the other end?
- Bob (Correct answer)
- Alice
- Carol
- Dan
Correct answer: Bob
With Carol at one end and Dan next to Alice, placing Bob at the other end satisfies the constraint that Alice is not next to Bob.
Question 5: Which of the following is logically equivalent to 'If it rains, the ground is wet'?
- If the ground is not wet, it did not rain (Correct answer)
- If the ground is wet, it rained
- If it does not rain, the ground is not wet
- Rain and wet ground always occur together
Correct answer: If the ground is not wet, it did not rain
The contrapositive of 'If P then Q' is 'If not Q then not P,' which is logically equivalent to the original statement.
Question 6: What letter comes next in the sequence: A, C, F, J, O, ?
- U (Correct answer)
- T
- S
- V
Correct answer: U
The gaps between letters increase by 1 each time: +2 (A→C), +3 (C→F), +4 (F→J), +5 (J→O), +6 (O→U).
GRT GRT Logical Reasoning 1
If all Bloops are Razzies, and all Razzies are Lazzies, which of the following must be true?