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  9. Q42

RRB NTPC 2026 · Question 42 of 93

The mean proportional between (9 + 4 5) and (18 − 8 5) is:​ ​ ​

  1. A5​ ​
  2. B15​ ​
  3. C17​ ​
  4. D2​ ​Correct

Answer: D. 2​ ​

Explanation

Given: (9 + 4 5) and (18 − 8 5) ​ ​ Solution: Mean proportional of A and B = AB ​ ​Solution: ​(9 + 4 5) and (18 − 8 5) ​ ​ = (9 + 4 5) (18 − 8 5) ​ ​ ​ = (9 + 4 5) × 2 (9 − 4 5) ​ ​ ​ 2 = 2 (92 − (4 5) ) ​ ​ = 2 × (81 − 80) ​ = 2​ ​ ​ ​

Source: RRB NTPC CBT-I Memory-Based Paper 16 March 2026 S1 (careerpower test-platform compilation) · memory-based

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