- #1

e^(i Pi)+1=0

- 247

- 1

## Homework Statement

f is a function defined on natural numbers such that

2f(n) * f(2n+1) = f(2n) *[2f(n) + 1] and

8f(n) > f(2n) > 4f(n)

Find value of f(12)

## The Attempt at a Solution

[itex]f(n)=\frac{f(2n)}{2f(2n+1)-2f(2n)}[/itex]

[itex]f(12)=\frac{f(24)}{2f(25)-2f(24)}\frac{}{}[/itex]

2f(n) > f(n) so f(n) > 0 and f(2n) > 0

Because [itex]\frac{f(2n)}{2f(2n+1)-2f(2n)} > 0[/itex] and f(2n) > 0 we know that

f(2n+1) > f(2n) so [itex]f'(n) > 0[/itex]

Other than that, I have no idea. Math level: ODEs