Question

If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2+b2+c23 is :
A) M
B) 3 M^2
C) 2 (M/3)
D) M^2

Answer 1

Answer:

Step-by-step explanation:

B) 3 M^2  

Explanation:

We have : ( a + b + c) / 3 = M   or (a + b + c) = 3M.

Now. (a+b+c)2=(3M)2=9M2 .

<=>a2+b2+c2+2(ab+bc+ca)=9M2

a2+b2+c2=9M2   ,(ab+bc+ca=0)      

Required mean =(a2+b2+c23)=9M23=3M2 .

Answer 2

Answer:

B 3m^2

Step-by-step explanation:

go on to the above answer