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Which option follows the same logic as 12-36-72-92; 15-45-90-110?
18-54-108-128
10-30-60-70
20-60-120-150
14-42-84-94
18-54-108-128
The given number sequences follow a specific mathematical operation pattern where the first number is multiplied by 3, the second number is multiplied by 2, and 20 is added to the third number to obtain the fourth number. Applying this exact logic of multiplying by 3, multiplying by 2, and adding 20 to the base number 18 yields 18, 54, 108, and 128 respectively. Therefore, Option A is the correct matching sequence.
The given number sequences follow a specific mathematical operation pattern where the first number is multiplied by 3, the second number is multiplied by 2, and 20 is added to the third number to obtain the fourth number. Applying this exact logic of multiplying by 3, multiplying by 2, and adding 20 to the base number 18 yields 18, 54, 108, and 128 respectively. Therefore, Option A is the correct matching sequence.
Number analogy and logical reasoning frameworks form a core component of the General Intelligence and Reasoning section in RRB CBT-1 examinations, testing foundational arithmetic and pattern recognition skills.
The operational rule for the given sequences is multiplication by 3 followed by multiplication by 2 and addition of 20.
For the base number 18, the sequence calculates as 18 multiplied by 3 equals 54, 54 multiplied by 2 equals 108, and 108 plus 20 equals 128.
Incorrect options fail to maintain the constant final increment of 20 or the strict multiplication sequence of 3 and 2.
Option B fails because the final increment from 60 to 70 is only 10 instead of 20.
Option C fails because the final increment from 120 to 150 is 30 instead of 20.
Option D fails because the final increment from 84 to 94 is 10 instead of 20.
Such multi-step operation questions test precision and quick mental calculation under RRB time constraints.
A is correct тАФ Option A follows the identical mathematical logic of multiplying by 3, multiplying by 2, and adding 20.
Mastering multi-step number and alphabet analogies enhances performance across both Number Series and Coding-Decoding sections in railway and banking exams.
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