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Sunday, September 16, 2007

Fibonacci sequence in the Pascal triangle

Where is the Fibonacci sequence in the Pascal triangle?

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
1 8 28 56 70 56 28 8 1
1 9 36 84 126 126 84 36 9 1

Count as follows.
Start left with a 1.
While on a number:
- Move right
- Move up
- Add to running total.

Let's go.
First row.
1.
Stop.

Second row.
1
Stop.

Third row.
1, right, up
1
Stop.

Fourth row
1, right, up
2
Stop.

Fifth row
1, right, up
3, right, up
1
Stop.

Sixth row
1, right, up
4, right, up
3
Stop.

Totals were 1, 1, 2, 3, 5, 8.

Fibonacci sequence, obvious.

Now what's the proof?

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(Raumpatrouille – Die phantastischen Abenteuer des Raumschiffes Orion, colloquially aka Raumpatrouille Orion was the first German science fiction television series. Its seven episodes were broadcast by ARD beginning September 17, 1966. The series has since acquired cult status in Germany. Broadcast six years before Star Trek first aired in West Germany (in 1972), it became a huge success.)