RRB NTPC · Question 50
Calculate the sum of squares from 1 to 9. A. 284 B. 285 C. 385 D. 380
Show answer & explanation
Answer: (A) B
Explanation
Sum of squares of 1 to n = n(n + 1)(2n + 1)/6. For n = 9: 9 × 10 × 19/6 = 285.
Railways PYQCBT 1 2016
RRB NTPC · Question 50
Answer: (A) B
Sum of squares of 1 to n = n(n + 1)(2n + 1)/6. For n = 9: 9 × 10 × 19/6 = 285.