Progression (Sequence and Series)Hard
Question
The mean of the squares of first n natural numbers is-
Options
A.
n2
n2B.n (2n + 1)/6
C.n (2n + 1)/3
D. (n + 1)(2n + 1)/6
More Progression (Sequence and Series) Questions
S.D. of n observations a1, a2, a3,....,an is σ, then the S.D. of the observations λa1, λa2, λa3, &#...The standard deviation of a variate x is σ. The standard deviation of the variable ; a, b, c are constants, is-...The sum of the series - .... upto ∞ is equal to...Three numbers a,b, 12 are in G.P. and a, b,9 are in A.P., then a and b are -...If the angles A, B and C of a triangle are in an arithmetic progression and if a, b and c denote the lengths of the side...