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If the mean of a ,\ b ,\ c is M and a...

If the mean of `a ,\ b ,\ c` is `M` and `a b+b c+c a=0` , then the mean of `a^2,\ b^2,\ c^2` is `M^2` (b) `3M^2` (c) `6M^2` (d) `9M^2`

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