Hari (H), Gita (G), Irfan (I) and Saira (S) are siblings. If H is older than G, I is younger than S, and G is older than S, what is the sequence from oldest to youngest?
Options:
(A) H-G-S-I
(B) S-G-H-I
(C) I-G-S-H
(D) I-H-S-G
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2010 Q.65)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: General Aptitude
- **Question Type**: **MCQ** (2 Marks)
- **Core Topic**: Biochemistry, Microbiology & Molecular Biology
**2. Detailed Step-by-Step Analytical & Scientific Derivation**:
- **Systematic Conceptual & Option-by-Option Evaluation**:
- Problem Focus: *"Hari (H), Gita (G). Irfan (1) and Saira (S) are siblings (i.e. brothers and sisters). All were born on
1" January. The age difference between any two successive siblings (that is bom one after another)
is less than 3 yea..."*
- **Option (B) [CORRECT]**: *"SGHI"*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (A) [INCORRECT]**: *"HSIG"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"IGSH"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"IHSG
END OF THE QUESTION PAPER
BT
1216
--- PAGE 13 ---
2010
ĐT
Space for R"* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **B**
- **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).
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