Question 14
SSC-CGL 2020 Mar 3 Shift 2
What is 1 + 4 + 9 + 16 + 25 + . . . n²?
Solution in Brief
This is a standard formula. I will list all such formulas.
Sum of first N natural numbers is N(N + 1)/2
Sum of squares of first N natural numbers is N(N + 1)(2N + 1)/6
Sum of cubes of first N natural numbers is [N(N + 1)/2]²
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