"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,\
Channel: Doubtnut
Date: 2020-04-05

"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`"