Question

Find f(5) for this sequence:

f(1) = 2 and f(2) = 4, f(n) = f(1) + f(2) + f(n - 1), for n > 2.

Answer 1

help will give medal

Answer 2

have you done sequences before?

Answer 3

not really

Answer 4

ok,
so we have the formula:
f(n) = f(1) + f(2) + f(n - 1)
every where you see a f(1), replace it with a 2 becuase f(1)=2
everywhere you see a f(2), replace it with a 4 becuase f(2)=4
now, what does the formula look like now?

Answer 5

confusing still

Answer 6

thanks for being honest!
I'll do the first part so you can see...

the formula:
f(n) = f(1) + f(2) + f(n - 1)
every where you see a f(1), replace it with a 2 becuase f(1)=2

So it becomes
f(n) = 2 + f(2) + f(n - 1)
you try the other part, "everywhere you see a f(2), replace it with a 4 becuase f(2)=4"

Answer 7

so whats the answer

Answer 8

http://www.youtube.com/watch?v=C7tE26CDI2M

Answer 9

whats the answer though

Answer 10

you'll have to find someone else to help you if you are looking for answers, cya!

Answer 11

ok thanks

Answer 12

To find f(5) you just sustitute 5 in the formula.