Question

What is the next term in the following sequence: 3, -15, 75, -375…?
What is the rule for the following sequence: 8, 4, 2, 1…?

Answer 1

for the first one calculate second term / first term
and third term / second term
what do you notice?

Answer 2

1. 1875
2. Dividing by 2.

Answer 3

for the first one i think it is
an = a1 * (1/2)(n-1), a1 = 8
btw

Answer 4

@Kash_TheSmartGuy
please don't give direct answers - read the code of conduct

Answer 5

Sorry

Answer 6

But the second ones answer isn't on the choices

Answer 7

the first one is a geometric sequence where the next term is obtained by multiplying by a common ratio

Answer 8

the second one is also geometric - do you know what the nest number is?

Answer 9

you mean next

Answer 10

and I think it should be .5

Answer 11

yes not nest!!

Answer 12

right
each term is formed by multiplying by 0.5
- same thing as dividing by 2 as Kash said

Answer 13

and if you do the divisions i mentioned in my first post you'll get the common ratio for the first sequence

Answer 14

and to get the next term you multiply -375 by this common ratio

Answer 15

an = a1 * (1/2)(n-1), a1 =8 I guess maybe