X,Y,Z, W are integers. the expression X-Y-Z is even and the expression Y-Z is odd. if X is even then what must be true??
a)W must be odd.
b) Z must be odd.
c) W must be even.
d)Y-Z must be odd.

• option b is correct.
  here given x-y-z = even
  and x is also given even
  y+z= even - even
  y+z is also even
  so we get y and z both are even or odd
  if both are even that time y-z is also even
  but in ques given y-z is odd
• 9 years agoHelpfull: Yes(5) No(0)
• ques. is incomplete
• 9 years agoHelpfull: Yes(1) No(0)
• it might be the dummy question.. because the ans for first condition is negative for some cases
• 9 years agoHelpfull: Yes(0) No(0)
• question is wrong as even-even=even;
  as x is even and x-y-z is even, so (y+z)=even.............1st equation
  and it is also given that y-z is odd ..............2nd equation
  1st and 2nd equation are contradictory so qestion is wrong miss luna dutta
• 9 years agoHelpfull: Yes(0) No(0)
• None of These
• 9 years agoHelpfull: Yes(0) No(0)
• correct ANSWER IS a) W MUST BE ODD
  think a lil bit, explaination is not neccessay!
• 9 years agoHelpfull: Yes(0) No(0)
• w must be odd
• 8 years agoHelpfull: Yes(0) No(0)