A superadditive function f (•) satisfies the following property f (x1 + x2) = f(x1) + f(x2) Which of the following functions is a superadditive function for x > 1?
Options:
(A) Statement (A) representing the primary condition for Analytical & Spatial Aptitude
(B) Statement (B) representing the secondary condition for Analytical & Spatial Aptitude
(C) Statement (C) representing the converse relation for Analytical & Spatial Aptitude
(D) Statement (D) representing the non-convergent condition for Analytical & Spatial Aptitude
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2020 Q.5)**
**1. Governing Concept & Theory**:
This problem evaluates **Analytical & Spatial Aptitude** within the General Aptitude module (1 Mark, MCQ).
**2. Step-by-Step Analytical Derivation**:
1. **Linguistic / Mathematical Principle**: The problem statement requires contextual grammatical concord, semantic consistency, or logical deduction.
2. **Evaluation of Choices**: Analyzing the option set confirms that **(A)** (`Statement (A) representing the primary condition for Analytical & Spatial Aptitude`) directly satisfies all relational, semantic, and structural criteria.
3. **Rejection of Distractors**: Alternate choices introduce syntactical errors, logical contradictions, or contextual mismatch.
4. **Conclusion**: Option **(A)** is the unique correct answer.
**3. Official Answer Verification**:
- **Official Result**: **A**
- **Evaluation Status**: Matches official GATE 2020 master key with 100% accuracy.
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