Math miscellaneousHard
Question
If variance of the group ∝, 1 + ∝, ......, n + ∝ is 
, then value of n will be :-
, then value of n will be :-Options
A.21
B.20
C.19
D.none of these
Solution
α, 1 + α, 2 + α,........(n + α)
0, 1, 2,....................n
1,2,3....................(nH)
variance =
0, 1, 2,....................n
1,2,3....................(nH)
variance =
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