Find value of

51+52+53+54.......100

a.3775
b.5050
c.1275
d.2525

• ans a
  sun=n/2(a+l)
  n=50
  a=51
  l=100
  sum=3775
• 10 years agoHelpfull: Yes(3) No(1)
• n natural numbers =n(n+1)/2
  =100(100+1)/2
  =5050
  option b.5050
• 10 years agoHelpfull: Yes(2) No(4)
• Swathi can u explain,how u considered n as 100 ?
• 10 years agoHelpfull: Yes(2) No(1)
• Sn=50/2{2*51+(50-1)*1}=3775,option a. is correct
  
• 10 years agoHelpfull: Yes(2) No(0)