two consecutive numbers are removed from the progressions 1,2,3............n the arithmetic mean of the reamaining number is 261/4.the value of n is
a)cannot be determined
b)60
c)50
d)81

• sum of natural number or consecutive = n*(n+1)/2
  And the mean of this consecutive no is
  = (n*(n+1)/2)/n
  = (n*(n+1)/(2*n))
  = (n+1)/2
  Therefore,
  (n+1)/2 = 261/4
  (n+1)= 261/2
  So, n = (261/2-1)=129.5
  which near equals to 130
  
  Wrong options
• 9 years agoHelpfull: Yes(0) No(2)
• C)50
  After removing any two consecutive numbers the average will be in the range of (n+1/2)-1 to (n+1/2)+1.
  
• 7 years agoHelpfull: Yes(0) No(0)