sequence question - what's the next number in the series: 1,2,0,3,-1?

[theNEOone]

a. 5
b. 4
c. -3


=|

 

[Al Neri]

4

edit

the way i got it

1 + 1 =
2 - 2=
0 +3 =
3 - 4 =
-1 + 5=

4

 

[Kalvin00]

4....thats pretty simple

 

[Al Neri]

is this for a calliper test?

 

[Cattlegod]

Originally posted by: Kalvin00
4....thats pretty simple

 

[EngenZerO]

Originally posted by: Don Rodriguez
4

edit

the way i got it

1 + 1 =
2 - 2=
0 +3 =
3 - 4 =
-1 + 5=

4

same thing i did.

 

[jman19]

B, easy.

 

[theNEOone]

thanks, just making sure


=|

 

[FoBoT]

3.9999999999999999999999999999

 

[EvilYoda]

yep, 4.

 

[RapidSnail]

Answer:

1, 2, 0, 3, -1, 4

Pattern:

Every two numbers added equals three. The leftmost number of the pair is dropped one digit in every subsequent pair. The rightmost number of the pair is raised one digit every subsequent pair.

1 + 2 = 3

0 + 3 = 3

-1 + 4 = 3

 

[raz3000]

I didn't get it I am teh suck.

 

[alkemyst]

Originally posted by: raz3000
I didn't get it I am teh suck.

I had it solved when I saw it in the topics...came in and was going to post 'Why the F is this multiple choice'.

then I saw your post. ouch.

1, 2, 0, 3, -1, 4, -1, 5, -1 ... however; based on such a short sequence the easy solution may be a red herring.

 

[PELarson]

Originally posted by: alkemyst

Originally posted by: raz3000
I didn't get it I am teh suck.

I had it solved when I saw it in the topics...came in and was going to post 'Why the F is this multiple choice'.

then I saw your post. ouch.

1, 2, 0, 3, -1, 4, -1, 5, -1 ... however; based on such a short sequence the easy solution may be a red herring.

Are you sure.

It would seem that the sequence would be.

1,2,0,3,-1,4,-2,5,-3,6,-4

Odd numbers, sequence position, decrease by 1 off of the base
Even numbers, sequence position, increase by 1 off the base.

 

[alkemyst]

Originally posted by: PELarson

Originally posted by: alkemyst

Originally posted by: raz3000
I didn't get it I am teh suck.

I had it solved when I saw it in the topics...came in and was going to post 'Why the F is this multiple choice'.

then I saw your post. ouch.

1, 2, 0, 3, -1, 4, -1, 5, -1 ... however; based on such a short sequence the easy solution may be a red herring.

Are you sure.

It would seem that the sequence would be.

1,2,0,3,-1,4,-2,5,-3,6,-4

Odd numbers, sequence position, decrease by 1 off of the base
Even numbers, sequence position, increase by 1 off the base.

It's a possibility...like I said such a short sequence makes it hard to determine except to those that don't understand how complicated even what a simple looking sequence can be [but I put that time in my life with the skeletons in my closet ].

EDIT: n/m your solution was in the multiple choice....starting to feel my liver workout now.

 

[DrPizza]

I don't have the link right here... but search for the encyclopedia of sequences.. (OEIS or something like that)... Type in 4 or 5 numbers in a row, and sometimes there are hundreds of different valid sequences that begin with those numbers.

Had to look... here it is... Regardless, for those who like math, it's fun just to play around with.

 

[DrPizza]

Here's one: 2, 4, 6, 8, 10, 12, 14, 16, 18,

what comes next? 20? Sure, but I'm thinking of a different sequence that starts out that way:
N + the product of the non-zero digits in N
2, 4, 6, 8, 10, 12, 14, 16, 18, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 22, 23, 26, 29, 32, 35, 38,. . .