Question

What is the sum of the geometric -4, 24, -144,... if there are 7 terms? Answers to choose from.

a)-411,772
b)308,829
c)-159,964
d)119,973

Answer 1

@sauravshakya

Answer 2

@T-Wrx

Answer 3

@Spectrum

Answer 4

@sauravshakya can you help me please

Answer 5

There first term is -4 and common ratio is 24/(-4) =-6
Now,
Sn = a(r^n -1)/(r-1)

Answer 6

Does it help?

Answer 7

yes

Answer 8

so, what did u get?

Answer 9

i got -159,964

Answer 10

is this correct @sauravshakya ?

Answer 11

very correct

Answer 12

thank you

Answer 13

welcome