Question

What is the 13th term in the Fibonacci Sequence?





Term


1


2


3


4


5


6


7


8


9




Fibonacci Number


1


1


2


3


5


8


13


21


34

Answer 1

233?

Answer 2

For larger values of n, you can also use the explicit formula:
F(n)=(phi^n-psi^n)/sqrt(5)
where
phi=(1+sqrt(5))/2, and
psi=(1-sqrt(5))/2
Here F(13)=233

Answer 3

thank u for explaining

Answer 4

can u show me how to fined my other question

Answer 5

You're welcome!
A note of caution: the formula involves irrational numbers, but it all cancels out in the end to give an integer. Using a calculator, it may involve rounding.