we have to find the missing no between 1 to 100. (Use only three arithmatic expressions)

• Take sum of numbers from 1 to 100 using formula n(n+1)/2
  100*101/2 = 5050
  now sum all given numbers and subtract the sum from 5050 to get required no.
  eg. if 55 is missing sum will be 4995
  so, 5050 - 4995 =55
• 9 years agoHelpfull: Yes(1) No(0)