1,6,7,13,20.....Find the sum of first 52 terms!

• 352849027131
• 10 years agoHelpfull: Yes(1) No(10)
• @ Bhagyasri..can yu please explain how?
  
• 10 years agoHelpfull: Yes(1) No(1)
• 6+1=7
  7+6=13
  13+7=20
  .... go on adding :p
• 10 years agoHelpfull: Yes(1) No(3)
• as 1+6+7 is sum upto 3rd tem n it is 5th term -6, similarly
  as 1+6+7+13+20+33+53 is sum upto 7th term and is equal to 9th term 139-6=133
  hence sum upto 52nd term is 54th term-6
  using golden ratio we can solve this, bt to be more accurate we calculate a few more terms. 1,6,7,13,20,33,53,86,139,225,364,589,953,1542....
  thus 54th term= 1542*(1.6180339)^40
  hence sum upto 52nd term is 352849113676-6=352849113670
  
• 10 years agoHelpfull: Yes(1) No(0)