Santa has all digit of odd no. Banta has all digit of even no. Santa squares his digit and add them . Banta also squares his digits and add them. Then what is the differnce of the two....

• As per gaurav if question was santa has all two digit odd nos and banta has all two digit even nos....
  then soln is :
  
  Santa - 11 13 15 17 19 21 ............................................. 99
  Banta - 10 12 14 16 18 20 ............................................. 98
  
  we need to calculate
  (11^2 + 13^2 + 15^2 + 17^2 + 19^2 + 21^2 ............................................. 99^2 ) - (10^2 12^2 14^2 16^2 18^2 20^2............................................. 98^2 )
  
  OR
  
  = (11^2 - 10^2) + (13^2 - 12^2) + (15^2 - 14^2) + ............................... + (99^2 - 98^2)
  = 21 + 25 + 29 + .................................... 197
  this is an AP
  
  so sum = n/2(a+l)
  
  = 45/2(21+197)
  = 4905 Ans
• 9 years agoHelpfull: Yes(14) No(0)
• sq of even no.'s (4+16+36+64+100)
  sq of odd no.'s (1+9+25+49+81)
  
  difference is 45
• 9 years agoHelpfull: Yes(4) No(1)
• Difference should be 45
• 9 years agoHelpfull: Yes(2) No(3)
• question was santa hai all two digit odd nos and banta has all two digit even nos....
  correct it plz
• 9 years agoHelpfull: Yes(2) No(0)
• difference is 55
• 8 years agoHelpfull: Yes(0) No(0)