A, B, C, D, E, F and G are seven positive integers.
I) AB is odd. II) C+ DE is odd.
III) AD is odd. IV) F – G is odd.
How many of the above integers are odd?
a) 5 b) 3 c) 4 d) 6

• ans:6=A,B,C,D,F,G;Emust be even
  1.AB odd means (odd x odd = odd) A&B odd;
  2.AD odd means (odd x odd = odd) D odd;
  3.case1:C+DE odd means(odd+even = odd) so C must be odd E must be even;
  
  4.case2:C+DE odd means(odd+even = odd) so E must be odd C must be even;
  it meanes C or E odd.(with selp of step5 c must be odd)
  5.FACG odd means (odd x odd = odd) F,A,C,G is odd;
  
• 13 years agoHelpfull: Yes(28) No(1)
• Answe is a) 5
  
  Since AB is odd, B is odd - 1
  Since C + DE is odd, either C or E is odd - 1
  Since AD is odd, D is odd - 1
  F & G are odd - 2
• 13 years agoHelpfull: Yes(0) No(14)
• answer is c because AB is odd so B is odd
  c+DE is odd so eiher c is odd or E is odd
  AD is odd so D is also odd
  F-G is odd so in his case also either of F or G is odd.
  there are 4 no which are odd
• 9 years agoHelpfull: Yes(0) No(0)
• kiran F and G both cannot otherwise F-G will be even
  so ans is 5
• 9 years agoHelpfull: Yes(0) No(0)