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If 5 + 5 = 25, 6 + 6 = 36, then 9 + 9 = ?
45
72
81
90
81
The pattern follows the multiplication rule where (x + x) is represented as x multiplied by x, resulting in a square of the integer. Thus, 9 + 9 corresponds to 9 multiplied by 9, which equals 81.
The pattern follows the multiplication rule where (x + x) is represented as x multiplied by x, resulting in a square of the integer. Thus, 9 + 9 corresponds to 9 multiplied by 9, which equals 81.
The concept of 'Squares' is a fundamental pillar of Quantitative Aptitude, which in Indian competitive exams is categorized under Numerical Ability, a subject mandated by the RRB JE and SSC CGL recruitment notification syllabus.
This question tests pattern recognition and logical arithmetic operations rather than standard algebraic addition.
The rule applied is a(b + b) = b * b or simply n * n where n represents the integer provided.
Such questions are common in RRB CBT-1 reasoning sections to test mental alertness under time pressure.
Mathematical reasoning sections in RRB exams often utilize non-standard operator definitions to differentiate between arithmetic and logic skills.
Option A (45) is a common distractor based on standard addition (18) multiplied by 2.5, which does not follow the established sequence.
Option B (72) represents the product of 8 and 9, which is irrelevant to the established square-based sequence.
Option D (90) represents 10 times 9, failing to satisfy the rule where both input factors must be identical.
C is correct тАФ The pattern follows the square of the given integer, so 9 squared equals 81.
Always verify if the operator '+' is being used in its literal mathematical sense or as a placeholder for a custom function before calculating.
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