Answers

2016-07-15T14:17:26+08:00
    r  =   16/64  =   1/4
  
    s∞  =    a/1-r             /  a = first term  &   r = common ratio
           =   64/(1-1/4)
           =   64/(3/4)
           =   64*4/3  =   85.3333...
                             =  851/3

0
the correct answer is Sn=256/3
you are right, I made a mistake in my calculations, Thanks so much for correcting me