If 5*8=28
3*7=12
8*6=35
13*13=?
(a) 169
(b) 130
(c) 140
(d) 144

• (5-1)*(8-1) = 4*7 = 28
  (3-1)*(7-1) = 2*6 = 12
  (8-1)*(6-1) = 7*5 = 35
  (13-1)*(13-1) = 12*12 = 144
  
  Ans : (d) 144
• 10 years agoHelpfull: Yes(6) No(0)
• first 5*8=40;
  5+8=13;
  40-13=27;
  27+1=28;
  for second one
  3*7=21;
  3+7=10;
  21-10=11;
  11+1=12;
  for third one
  8*6=48;
  48-14=34;
  34+1=35;
  hence13*13=169;
  13+13=26;
  169-26=143;
  143+1=144;
  ans is 144;
• 10 years agoHelpfull: Yes(1) No(0)
• 5*8=28=>4*7
  3*7=>2*6 so
  13*13=>12*12
  ans 144
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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• 10 years agoHelpfull: Yes(1) No(0)
• d)144
  (5-1)*(8-1)=4*7=28
  similarly
  (13-1)*(13-1)=12*12=144
• 10 years agoHelpfull: Yes(0) No(0)
• 5*8=a*b => (a-1)*(b-1)=(5-1)(8-1)=4*7=28
  similarly remaining
  13*13= (13-1)*(13-1)=12*12=144
• 10 years agoHelpfull: Yes(0) No(0)
• 144
  (5-1)*(8-1)=4*7=28
  simillarly (13-1)*(13-1)=12*12=144
• 10 years agoHelpfull: Yes(0) No(0)
• 5*8=(5-1)*(8-1)=4*7=28
  3*7=(3-1)*(7-1)=2*6=12
  8*6=(8-1)*(6-1)=7*5=35
  13*13=(13-1)*(13-1)=12*12=144
• 10 years agoHelpfull: Yes(0) No(0)
• (5-1)*(8-1) = 4*7 = 28
  (3-1)*(7-1) = 2*6 = 12
  (8-1)*(6-1) = 7*5 = 35
  (13-1)*(13-1) = 12*12 = 144
  
  Ans : (d) 144
• 10 years agoHelpfull: Yes(0) No(0)
• Option:4
  Logic is,13*13=169,13+13=26
  169-26=143+1=144
• 10 years agoHelpfull: Yes(0) No(0)
• 5*8=40-(5+8)+1=28
  3*7=21-(3+7)+1=12
  8*6=48-(8+6)+1=35
  13*13=169-(13+13)+1=144
• 10 years agoHelpfull: Yes(0) No(0)
• 5*8=28 // (5-1)*(8-1)=28
  IN SAME WAY,13*13=(13-1)*(13-1)=144
• 10 years agoHelpfull: Yes(0) No(0)
• Ans 144
  
  (5-1)*(7-1)=28,
  
  (3-1)*(7-1)=12,
  
  (8-1)*(6-1)=35.
  
  Similarly we get
  
  (13-1)*(13-1)=144
• 10 years agoHelpfull: Yes(0) No(0)
• (5-1)*(8-1)
  (3-1)*(7-1)
  (8-1)*(6-1)
  (13-1)*(13-1)
  (d)144
  
• 10 years agoHelpfull: Yes(0) No(0)
• (5*8)-{(5+8)-1}=28
  (3*7)-{(3+7)-1}=12
  (8*6)-{(8+6)-1}=35
  
  in this way.....
  
  (13*13)-{(13+13)-1}=144
• 10 years agoHelpfull: Yes(0) No(0)
• (5-1)*(8-1)=28
  (3-1)*(7-1)=12
  (8-1)*(6-1)=35
  (13-1)*(13-1)=144
• 9 years agoHelpfull: Yes(0) No(0)