If then the value of (x +y +z) is

If pq+qr+rp=0 then find the value of

(x+2y) (x² + 4y² – 2xy) equal to- 

If then is equal to

If (a-b)² + (b-c)² + (c-a)² = 0, then find the value of (a³+b³+c³-3abc) ?

If  then find the value of

If a =500, b=502 and c=504, then the value of a³ +b³ +c³-3abc

If then what is the value of of ?