Ganian asked Anibe to add the first n natural numbers. While adding, Anibe, being forgetful. missed 3 consecutive numbers out and answered 1348. What is the greatest of the 3 values she left out?

• we can calc the sum of n natural nums by using the formula S=n(n+1)/2
  for n=52, the sum is 1378.
  given sum value is 1348.
  so, the sum of missed nums = difference of 1378 and 1348 i.e., 30.
  the consecutive nums making the sum 30 are 9, 10, 11.
  hence the greatest number among missed nums is 11
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