Question

what is the sum of geometric sequence -4,12,-36 if there are 7 terms
PLLLLEASSEE help me please

Answer 1

@Ilovecake

Answer 2

265,720

Answer 3

work please !!

Answer 4

can you help me @lala525

Answer 5

please

Answer 6

can you help me @sourwing

Answer 7

It is what I said^^^^

Answer 8

it is a G.P.
first term a=-4
common ratio r=12/-4=-3
\[Sn=\frac{ a \left( r^n-1 \right) }{ r-1 }\]
Here n=7
find S7

Answer 9

r is the common rstio right

Answer 10

@surjithayer

Answer 11

correct