Data Sufficency
Find y
I.(X-4)=1
Ii.(X-4)(Y-4)=0

• only 2nd is sufficient to find y
  
  from 1st, (X-4)=1 => x=5
  whatever be value of x,2nd statement gives value of y=4
  no need to find x from 1st , if x=6,7,8,... then also y=4
  
  (X-4)(Y-4)=0 =>(y-4)=0 => y=4
  
• 10 years agoHelpfull: Yes(37) No(30)
• Both statements are required.
  If statement I is not given, then x can be equal to 4 and y can have any value.
  as x-4=1; in that case only , y has unique value ; i.e. y=4
• 10 years agoHelpfull: Yes(35) No(12)
• both statement are required . because if first statement is not given then two case arises :-
  
  x-4=0 or y-4=0
• 10 years agoHelpfull: Yes(11) No(2)
• Only second is sufficient because..
  
  (X-4)(Y-4)=0
  => Y-4=0 (X-4 goes to the right side and becomes 0)
  Y=4
• 10 years agoHelpfull: Yes(4) No(7)
• (x-4)(y-4)=0 means that (x-4)=0 and (y-4)=0 . Therefore y=4 The second is alone sufficient to answer
• 10 years agoHelpfull: Yes(4) No(3)
• only 2 is sufficiant
• 10 years agoHelpfull: Yes(3) No(0)
• hai rakesh, i think both statment is required.because,
  put (X-4)=1 in second.i.e.,
  (X-4)(Y-4)=0
  1(Y-4)=0
  y=4
• 10 years agoHelpfull: Yes(2) No(1)
• when x-4=1
  x=4+1
  x=5
  put value of x=5 in eq 2
  1.y-4=0
  y=4
• 10 years agoHelpfull: Yes(1) No(1)
• both statements are required
  bcoz, 1st we solve I) X-4=1 i.e X=5
  Then substitute the value of X in II)
  So, (5-4)(y-4)=0 => 1.(y-4)=0 => y=4
  
• 9 years agoHelpfull: Yes(1) No(1)
• Both I and II together give the solution....
• 9 years agoHelpfull: Yes(1) No(0)
• x=5
  put the value of x in 2nd part y=4
• 10 years agoHelpfull: Yes(0) No(1)
• both are required. if x=4, then y can have any value.
• 10 years agoHelpfull: Yes(0) No(1)
• both 1 and 2 give answer
• 9 years agoHelpfull: Yes(0) No(1)
• Both are required as with the second either x-4 is 0 or y-4 is 0 or both but using eq 1 it is ensured that y-4 is 0
• 9 years agoHelpfull: Yes(0) No(1)