RRB Technician Grade 3 previous year question
If 3^(2a−b) = 3a+b = √27, find the value of b.
Asked in RRB Technician Grade 3 (09 Mar 2026 Shift 1) · Quantitative Aptitude
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Correct answer: (B) 1/2
√27 = 31.5, so 2a−b = 1.5 and a+b = 1.5. Subtracting: (2a−b)−(a+b) = a−2b = 0 ⇒ a = 2b; substituting into a+b=1.5 gives 3b=1.5, so b = 0.5 = 1/2.
हिंदी में प्रश्न
यदि 3^(2a−b) = 3a+b = √27 है, तो b का मान ज्ञात कीजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 1/2
√27 = 31.5, अतः 2a−b = 1.5 और a+b = 1.5। घटाने पर a−2b=0 ⇒ a=2b; a+b=1.5 में रखने पर 3b=1.5, अतः b = 0.5 = 1/2.
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