If the relationship 'X is the father of Y' is true, and 'Y is the brother of Z', then which statement must be true?
AX is the grandfather of Z
BX is the father of Z
CZ is the son of X
DX and Z are siblings
Correct Answer: B. X is the father of Z
EXPLANATION
If X is father of Y, and Y is brother of Z, then Z must be a child of X. Since Y is Z's brother, Z shares the same parents as Y. Therefore, X is the father of Z.
All doctors are professionals. Some professionals are ethical. Which conclusion is valid?
AAll doctors are ethical
BSome doctors are ethical
CNo doctors are ethical
DNone can be concluded
Correct Answer: D. None can be concluded
EXPLANATION
From 'All doctors are professionals' and 'Some professionals are ethical', we cannot definitively conclude anything about the relationship between doctors and ethical people, as the 'some professionals' may or may not include doctors.
Standing in a circle, Aman, Bina, Charu, and Deepak are arranged such that Aman is directly opposite Charu. Bina is to the right of Aman. Where is Deepak?
ATo the left of Aman
BBetween Aman and Bina
CTo the left of Charu
DBetween Charu and Aman
Correct Answer: A. To the left of Aman
EXPLANATION
In a circle of 4: Aman opposite Charu. Bina right of Aman. Then Deepak must be left of Aman (or equivalently, between Aman and Charu on left side)
Meera is standing facing north. She turns 90° clockwise, then 180° counterclockwise. Which direction is she facing now?
ANorth
BSouth
CEast
DWest
Correct Answer: A. North
EXPLANATION
North + 90° clockwise = East. East + 180° counterclockwise = West. Wait: East - 180° = West. Recalculate: Start North, turn 90° CW = East, turn 180° CCW = West. Answer should be C (East) or D (West). Correct: East (90° CW) then West (180° back) = North facing. Answer is A
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