If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of 
by

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✪ Choose the correct option.

If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of gif is :

A. M
B. 3 M^2
C. 2 (M/3)
D. M^2

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