If the arithmetic mean of a, b, c is \(\rm \frac M 3\) and \(\rm \frac{1}{a} + \frac{1}{b} = -\frac{1}{c} \), then the arithmetic mean of a2, b2, c2 is

If the arithmetic mean of a, b, c is \(\rm \frac M 3\) and \(\rm \fr

1.	If the arithmetic mean of a, b, c is \(\rm \frac M 3\) and \(\rm \frac{1}{a} + \frac{1}{b} = -\frac{1}{c} \), then the arithmetic mean of a2, b2, c2 is
A.	M2/3
B.	3M2
C.	6M2
D.	9M2
Answer» B. 3M2

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If the arithmetic mean of a, b, c is \(\rm \frac M 3\) and \(\rm \frac{1}{a} + \frac{1}{b} = -\frac{1}{c} \), then the arithmetic mean of a2, b2, c2 is

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