If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of is :
Choose the correct choice from the following:
A) 3 M^9	B) 3 M^2	C) 3 M^6	D) 3 M^1	E) 3 M^7
Explanation:   We have : ( a + b + c) / 3 = M or (a + b + c) = 3M.   Now. .   Answer: 3 M^2) 3 M^2
<result>B</result>
If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of is :