## Eyad 2 years ago Geometric sequence of positive terms in which its first term equal 4 times its third term and the sum of its second term ,fifth term is 36 ..Find The G.s .....

1. ParthKohli

$$\Large \color{MidnightBlue}{\Rightarrow S_{g}= A{1 - r^n \over 1-r} }$$

@ParthKohli : What is Sg ?????

3. ParthKohli

Sum of a geometric sequence

4. ParthKohli

:P

@ParthKohli :And whats da function of this rule ,and how can i use it here ?!

6. ParthKohli

A is the first term.

7. ParthKohli

r is the common ratio, n is the number of terms.

i know :D

whats da benefit from getting the sum of geo.sequence ?

10. ParthKohli

Wait, what does G.s mean?

11. ParthKohli

Geometric sequence or sum?