Question

Write an explicit formula for the following sequence.

2, 4, 8, 16

Answer 1

do you know the formula in general

Answer 2

is that a geometric sequence or arithmetic ??

Answer 3

I do not know the formula, but I do know it is arithmetic

Answer 4

okay
arithmetic seq= when you have to add or subtract to get the next term
geometric seq= when you have to multiply or divide first term to get 2nd one

Answer 5

2 +2 =4
4 + 2 is not equal to 8

Answer 6

Is it An = 2n+1

Answer 7

a\[\huge\rm a_n = a_1 + (n-1)d\] formula for arithmetic sequence
for geometric sequence a
\[\huge\rm a_n = a_1 \times r^{n-1}\]

Answer 8

2, 4, 8, 16
is it geometric or arithmetic ?

Answer 9

Arithmetic

Answer 10

nope i just gave you the definition of arithmetic

Answer 11

\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
okay
arithmetic seq= when you have to add or subtract to get the next term
geometric seq= when you have to multiply or divide first term to get 2nd one
\(\color{blue}{\text{End of Quote}}\)
read this

Answer 12

4 do you have to add something or multiply by 4 to get 8 ?

Answer 13

Multiply

Answer 14

so that's why its geometric sequence :-)

Answer 15

so what is common ratio ??

Answer 16

1/2

Answer 17

geometric sequence when you multiply or divide to get next term
2 times 1/2 = ??
4 times /2 = ??

Answer 18

1, 2

Answer 19

Or is the ratio 2/1

Answer 20

yes 2
2 times 2 =4
4 times 2 = 8

when you multiply previous term by 2 you should get next term