If `a, b, c, a + b + c!=0 and 1/a+1/b+1/c=1/(a+b+c)`,then is `(a+ b +c)^5/(a^5+b^5+c^5)` is

If 1/(b-a) +1/(b-c)=1/a+1/c , then a,b and c are in

If (a + b - c) : ( b + c - a) : (a + c - b) = 6 : 5 : 7 , then (1)/(a) : (1)/(b) : (1)/( c) is equal to:

If ( a + b) : ( b + c ) : ( c + a) = 5 : 12 : 11 and a + b + c =28 , then (1)/( a) : (1)/( b) : ( 1)/( c ) is equal to:

If (a - b) = 3 , (b - c) = 5 and ( c - a) = 1 , then the value of (a^(3) + b^(3) + c^(3) - 3abc)/(a + b + c) is