Let x be the mean of squares of first n natural numbers and y be the square of mean of first n natural numbers. If x y = 55 42 , then what is the value of n?

NDA 2022 Mathematics question

Let be the mean of squares of first natural numbers and be the square of mean of first natural numbers. If , then what is the value of ?

Answer: (C)

and . So $ xy =

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-029512