What is the next number? 1,2,8,48,384,?

Answer 1

It's 3840. The pattern is
multiply by 2 then 4 then 6 then 8 then 10, ... .

Answer 2

1
1×2 = 2
2×4 = 8
8×6 = 48
48×8 = 384
384×10 = 3840
12x3480 = 41760

This can be written as either of the following:

(2n)!!
(2^n) n!

Note that !! does not mean to do factorial twice. The ! means factorial. !! means something called "double factorial."

So for n=5 (what you want), put:

(2^5) 5!

= 32 × (5 × 4 × 3 × 2 × 1)

= 32 × 120 = 3480

Double factorial is where you take every other one. For n=5, we can do:

(2×5)!! = 10!!

= 10 × 8 × 6 × 4 × 2

notice we take every other factor as we count down from 10

= 3480

Which also demonstrates how this recursion actually defines the !! function.

Answer 3

2 x 1 = 2
4 x 2 = 8
6 x 8 = 48
8 x 48 = 348
10 x 348 = 3480
12 x 3480 = 41,760

Answer 4

3840

1*2 = 2
2 *4 = 8
8 * 6 = 48
48 * 8 = 384
384 * 10 = 3840

thus multiply it times 10 to get 3840

Answer 5

1 2 8 48 384

Answer 6

Appears to be successive multiples of 2, so 10 x 384 = 3840

Answer 7

3840...each subsequent number is being multipied by the next number counted by two.

1 (x2) 2 (x4) 8 (x6) 48 (x8) 384 (x10) 3840.

Answer 8

3840
You are multiplying each term by,then 4, then 6, then 8 then 10, then 12, etc

Answer 9

3840 followed by 46080

in statistics this is called (perfect) autocorrelation


try a harder one

Answer 10

the sequence is like this!

1x2=2
2x4=8
8x6=48
48x8=384
so..
384x10=3840

hope this helped!