Question

Please help!

Answer 1

what can /\TLAS can do for you?

Answer 2

What is the 20th term in the sequence that begins -2, 4, -8, 16...

Answer 3

I know its multiplying by -2

Answer 4

it is a gp sereis

Answer 5

1st term is -2
2nd term is 4
.
.
.
in this way
nth term is (-1)^n*(2)^n

so 20th term is (-1)^20*(2)^20

Answer 6

so its D?

Answer 7

@sourav_aich where did you get the -1 and the 2?

Answer 8

you see each alternate term has negative in front of it
and 2 is the common ratio