RRB NTPC · Question 47
Find the value of [(525 + 252)^2 – (525 – 252)^2]/(525 × 252).
Show answer & explanation
Answer: (B) 4
Explanation
(a + b)² − (a − b)² = 4ab, so the expression = 4ab / ab = 4.
Railways PYQCBT 1 2016
RRB NTPC · Question 47
Answer: (B) 4
(a + b)² − (a − b)² = 4ab, so the expression = 4ab / ab = 4.