1-2,2-3,3-4,....-98+99=?

• ans: -97+99= 2
• 11 years agoHelpfull: Yes(15) No(9)
• 1-2
  2-3
  3-4
  .
  .
  .
  .
  97-98
  98-99
  99
  Cancel diagonally,thus only 1 is left over.
  Hence ans. is 1
  
• 11 years agoHelpfull: Yes(12) No(7)
• ans is 50.
  1-2,2-3,.... goes till 98 ,thus making 49 pairs.
  therefore sum of those 49 pairs is -49
  next,we need to add this result to 99( -49+99)
  hence the ans follows.
• 11 years agoHelpfull: Yes(6) No(11)
• Answer is 100 else Question is wrong !!!
• 11 years agoHelpfull: Yes(5) No(0)
• answer is 100 as all the digits except 1 and 99 will be cancelled out.
  so 1+99=100
• 11 years agoHelpfull: Yes(4) No(7)
• 98 is not cancelling out... so 2 is the ans..
• 11 years agoHelpfull: Yes(4) No(0)