A. says " the horse is not black".
B. says " the horse is either brown or grey."
C.says " the hoese is brown"
At least one is telling truth and atleast one is lying. tell the colour of horse.

• Assume horse is brown in color.......
  A ---- true , b----true , c------true......(NOT POSSIBLE-all three can't be true)
  
  assume horse is black in color
  A------FALSE , B-----FALSE , C----FALSE.......(Not possible -all three can't lie)
  
  So horse has to be grey in color.....:)
• 13 years agoHelpfull: Yes(27) No(0)
• The colour of the horse is GREY.
  A says TRUTH as "The horse is not black"
  C is LYING as "The horse is brown"
• 13 years agoHelpfull: Yes(3) No(0)
• TRUTH FALSE COLOR NOT POSSIBLE COLOR POSSIBLE VALIDITY
  --------------------------------------------------------------------------------
  A B,C BLACK ,BROWN ,GREY NO COLOR INVALID
  B A,C BROWN GREY/BLACK INVALID
  C A,B BROWN(acc. to C)
  But B says False (If Brown is correct......B must say truth) INVALID
  
  A,B C BROWN , BLACK GREY VALID
  :
  :
  :
  : & so on.....as per the valid case Horse is grey in color.....
• 13 years agoHelpfull: Yes(3) No(2)