Math Is Fun Forum

sankari

Member

Registered: 2006-12-06

Posts: 3

Find the next number...

Find next no. in the series: 3,10,7,12,-,9,16 
A.  14
B.  11 
C.  13
D.  12 

pl. help

Toast

Real Member

Registered: 2006-10-08

Posts: 1,321

Re: Find the next number...

uh, is that '-,9' just supposed to be a '-9'?

LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: Find the next number...

1. 3+4 = 7
2. 10+2 = 12
3. 7+2= 9
4. 12+4=16
5. 9+n=q
n=/=2, else no pattern.
n=2r
n can only be 4
q=13
answer = C.
next numbers: 18, 15, 22, 19, 24, 21, 28, 25 etc.

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I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...

sankari

Member

Registered: 2006-12-06

Posts: 3

Re: Find the next number...

3,10,7,12, ? 9,16

What is the number between 12 and 9

Options:

A 11
B  12
c  13
D 14

LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: Find the next number...

Delta n >= 2

Answer = 14.

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I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...

soha

Real Member

Registered: 2006-07-07

Posts: 2,530

Re: Find the next number...

ans 13

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LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: Find the next number...

Plz explain

has this serie got something to do with triangles?

Last edited by LQ (2006-12-07 21:50:26)

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I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...

soha

Real Member

Registered: 2006-07-07

Posts: 2,530

Re: Find the next number...

even i didnt understand

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"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay

sankari

Member

Registered: 2006-12-06

Posts: 3

Re: Find the next number...

I'm confused.... which is right?

numen

Member

Registered: 2006-05-03

Posts: 115

Re: Find the next number...

check this out:
http://www.research.att.com/~njas/seque … &go=Search

The only matching (integer) sequence would be the first of the three, none of the other are followed by either 11,12,13 or 14. But then, the rest are still wrong... If it really is a sequence (can't see it myself), nice find.

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LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: Find the next number...

3,10,7,12,14,9,16
number of odds = u
the space between u and next u can be either 2^(u-1), or some other chaotic system.
Note: u would work.

Guess number of even in a row is the total number of odd numbers. Possibly.

Can we make the asumption that the serie beginns with 3 for real?

Anyway, let's say that space between odd numbers = 2^(u-1). Then what is even numbers + odd numbers as a function of u when the n:th number is odd?

even numbers + odd numbers = n
F(2^(u-1)) + log2(2^(u-1)) + 1 = n
F(e^(ln(2)*(u-1))) + u-1 + 1 = n
e^(qln(2))/ln(2) + (u-1) + 1 = n

How do you get u?

Is it possible that the function is imaginary instead?

Last edited by LQ (2006-12-09 01:16:20)

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I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...