(4) If the equation f (x) = (a + b – c) x² + (b + c – a)x
+(c + a-b)=0 has only one root i.e., 1, then the value
3b + á<

(4) If the equation f (x) = (a + b – c) x² + (b + c – a)x
+(c + a-b)=0 has only one root i.e., 1, then the value
3b + á
is
of
C
0
(b)-1
(d) 2