Question

if a and b are the first two terms of a GP and l is the n th term then show that
Sn=(l*b-a^2)/b-a

Answer 1

Sum of n terms of a GP can be found using the formula
\[Sn=\frac{a_1(1-r^n)}{1-r}\]
where
\(a_1\)-first term
r-common ratio
Common ratio \(r_n\) can be found by using the formula
\[r_n=\frac{a_{n}}{a_{n-1}}\]
n can be found by using the formula
\(a_n=a_1r^{n-1}\)
Can u do nw @amruta1997?

Answer 2

hmmmmm

Answer 3

i will try

Answer 4

ok fine:)

Answer 5

1 question

Answer 6

ya vat is it @amruta1997?

Answer 7

r u there on fb

Answer 8

or skype

Answer 9

or gtalk

Answer 10

nope dear

Answer 11

none of them

Answer 12

nope

Answer 13

ohhhhhhhhh

Answer 14

u must have skype

Answer 15

many of my teachers have

Answer 16

oh i c. if u need any help u can tag me here or send me msgs here I will try my best to help u:)