MAH LLB 3 Year CET 2026 (1 April Shift 1)
Four people K, L, M, N have different blood groups (A, B, AB, O). L does not have A or AB. N has neither B nor O. M does not have O. Then who has blood group O?
Answer (Detailed Solution Below)View answer ▾Hide ▴
⚖️ More than one answer accepted
The official answer key accepts A and B for this question — either one scores the mark.
Official answer: Option A — K
Also accepted: Option B — L
Detailed Solution
Both (A) K and (B) L are accepted for this question; the officially declared answer is (A) K.
L is B or O (not A or AB). N is A or AB (not B or O). M is not O. So group O must belong to K or L.
Case K = O: then L = B, and M and N share A and AB. All clues hold, for example K = O, L = B, M = A, N = AB.
Case L = O: then K, M and N share A, B and AB with N in A or AB. All clues hold, for example L = O, K = B, M = A, N = AB.
✓ Check
Both arrangements satisfy every clue, so either K or L can have group O. One more clue (such as 'L does not have O') would be needed to fix a single answer.⚠ Common trap
Option C (M) is ruled out directly by the clue that M does not have O.Quick tip
List what each person can have; if two people remain possible for one item, both are accepted.
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Analytical Reasoning — Preparation
This question tests your understanding of Analytical Reasoning, a key topic in the Logical Reasoning section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Analytical reasoning questions give a set of conditions about people, objects or events and ask you to deduce facts from them. They include puzzles on scheduling (who does what on which day), distribution (who owns which item), floor-based puzzles, comparisons, and grouping or selection problems where certain people must or cannot be chosen together. The key is organising the information. Draw a table or grid with the categories as rows and columns, and fill in the definite clues first. Then use the conditional clues to eliminate possibilities, marking crosses for what is impossible and ticks for what is certain. When a clue leaves two possibilities, write both cases and test each against the remaining clues. Usually one case leads to a contradiction. Most puzzles have four or five questions, so time spent setting up a clear grid pays off. Practise the analytical reasoning puzzles below. Each solution shows the grid built step by step.