If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, – McqOptions

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1.	If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, b2, c2 is:
A.	3 M x M
B.	3 M
C.	9 M
D.	9 M x M
Answer» B. 3 M

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