Posted by **Renriki** on Tuesday, October 13, 2009 at 8:48pm.

"The combination is the seventh, ninth, and eleventh numbers in a sequence that begins 1,1,2,3,5,8,13, and so forth"

What is the combination?

I have a problem with this can you help?

- Math -
**Ms. Sue**, Tuesday, October 13, 2009 at 8:52pm
The adjoning two numbers are added together.

1 + 1 = 2

1 + 2 = 3

2 + 3 = 5

and so on

- Math -
**Christiaan**, Tuesday, October 13, 2009 at 8:54pm
This sequence is the Fibonacci sequence. Every number in this sequence is the sum of the two previous numbers:

1+1 = 2

1+2 = 3

2+3 = 5

3+5 = 8

5+8 = 13

The first seven numbers of the sequence are given, so to find the next four numbers add the two previous numbers.

Then you get:

1,1,2,3,5,8,13,21,34,55,89

So, the seventh, ninth, and eleventh numbers of this sequence are:

13,34 and 89

- THANKS -
**Renriki**, Tuesday, October 13, 2009 at 8:56pm
THANKS! I really didn't get it and everyone got it but me in my class.:D

- Math -
**Reiny**, Tuesday, October 13, 2009 at 9:17pm
You are encountering the wonderful world of the Fibonacci numbers.

Google: Fibonacci numbers

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