If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of is :
A) MB) 3 M^2C) 2 (M/3)D) M^2
Answer: B) 3 M^2
Explanation:
We have : ( a + b + c) / 3 = M or (a + b + c) = 3M.
Now. .
Required mean == = .
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