Let 
, 
, 
, 
... be the positive terms of a geometric sequence.
Calculate the terms and and write down the general term of this sequence.
Calculate between which consecutive terms of the sequence is the number 
. Write the answer.
Prove that the sum of 
is equal to 
.
Calculate the sum of type 
.
,
,
lies between the 
and 
terms of the geometric sequence.
