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sauravshakya Group Title

What is the n th term of the series: 1+1+2+3+5+8+13+21+...

  • 2 years ago
  • 2 years ago

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  1. Coolsector Group Title
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    A(n) = A(n-1) + A(n-2) where a1 = 1 and a2 = 1 ?

    • 2 years ago
  2. sauravshakya Group Title
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    In terms of n

    • 2 years ago
  3. estudier Group Title
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    Looks familiar....

    • 2 years ago
  4. Samkeyv Group Title
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    N th term is given by the formulae A(n)=A(n+1)+A(n+2) N=(n+1)+(n+2)

    • 2 years ago
  5. sauravshakya Group Title
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    ???

    • 2 years ago
  6. sauravshakya Group Title
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    I know |dw:1350296451209:dw|

    • 2 years ago
  7. sauravshakya Group Title
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    But what in terms of n only.

    • 2 years ago
  8. Coolsector Group Title
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    it's funny that there is a question about the golden ratio now

    • 2 years ago
  9. mukushla Group Title
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    it is fibonacci...

    • 2 years ago
  10. sauravshakya Group Title
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    Yes

    • 2 years ago
  11. kenttknguyen Group Title
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    In terms of n ----> FIBOnnACCI

    • 2 years ago
  12. mukushla Group Title
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    \[F_n-F_{n-1}-F_{n-2}=0 \ \ \ n\ge2\] setting up characterestic equation gives\[\lambda^2-\lambda-1=0\]wchich gives\[\phi_1=\frac{1+\sqrt{5}}{2}\]\[\phi_2=\frac{1-\sqrt{5}}{2}\]and so\[F_n=A\phi_1^n+B\phi_2^n\]and all u need is finding A and B using the values of \(F_0\) and \(F_1\)

    • 2 years ago
  13. mukushla Group Title
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    finally

    • 2 years ago
  14. sauravshakya Group Title
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    @mukushla how |dw:1350297426979:dw|

    • 2 years ago
  15. sauravshakya Group Title
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    oh I get it now...... thanx

    • 2 years ago
  16. Coolsector Group Title
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    @sauravshakya may you explain how ?

    • 2 years ago
  17. Coolsector Group Title
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    i thought i got it but i realized that i was wrong

    • 2 years ago
  18. Coolsector Group Title
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    ok got it .. nvm :)

    • 2 years ago
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