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progression problem
by mrinal mrinal - Wednesday, 9 December 2015, 04:06 PM
  find the sum

1/2+2^2/2^2+3^2/2^3+4^2/2^4+5^2/2^5+6^2/2^6.....

1)4 2)5 3)6 4)7
Re: progression problem
by minhaz pathan - Friday, 6 May 2016, 05:16 PM
  Answer is 6.
Re: progression problem
by Vaibhav Panchal - Thursday, 19 May 2016, 04:46 PM
  s=1/2+2^2/2^2+3^2/2^3+4^2/2^4+5^2/2^5+6^2/2^6.....

s/2 = 1/2+3/2^2+5/2^3+.......

s/4 = 1/2+2*((1/2)/(1-1/2)-1

s=4*3/2=6

ans= 6