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Two sets: 12-36-72-92; 15-45-90-110. Which follows the same pattern?
10-30-60-80
11-33-66-88
14-42-84-100
16-48-96-120
10-30-60-80
The given number sets follow a specific mathematical sequence where the second term is three times the first term, the third term is twice the second term, and the fourth term is obtained by adding twenty to the third term. Applying this exact pattern to Option A gives 10 multiplied by 3 equal to 30, 30 multiplied by 2 equal to 60, and 60 plus 20 equal to 80.
The given number sets follow a specific mathematical sequence where the second term is three times the first term, the third term is twice the second term, and the fourth term is obtained by adding twenty to the third term. Applying this exact pattern to Option A gives 10 multiplied by 3 equal to 30, 30 multiplied by 2 equal to 60, and 60 plus 20 equal to 80.
Number series and logical reasoning operations form a core component of aptitude sections in technical and non-technical recruitment examinations conducted by the Railway Recruitment Board (RRB).
The first transformation in each set is multiplying by 3.
The second transformation is multiplying the result by 2.
The final transformation involves adding 20 to the third number.
Option A matches the pattern completely with the sequence 10, 30, 60, 80.
Option B is incorrect because the final increment is 22 instead of 20.
Option C is incorrect because the final increment is 16 instead of 20.
A is correct тАФ Option A accurately replicates the established sequence of multiplying by 3, multiplying by 2, and adding 20.
Practicing mixed arithmetic operations involving both multiplicative and additive sequences enhances speed and accuracy in RRB CBT-1 exams.
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