The Question of Life

[101dalmatians]

This question is like impossible unless you have like 2 minutes! ( That's what I think...)
This is a characteristic Fibonacci sequence - they ask for the sum of it...
So, this is it:

5+6+11+17+28+45+.....+191

I know how to do this. I know that you have to find two more terms after the given ( in this case 191) and subtract the second term value from it.
However, if I don't have the last two terms given to me, how am i going to be able to solve this problem?
The thing is they have given me the last term: 191 but they have not given the second to last number to me making things harder for me...
Is there another way to approach this problem?
OR do I have to add all the terms until I get to the second to last term ( trust me, I don't want to waste my time on this...)
Will there be questions like this - with the second to last term not given?
Or is this a printing mistake of some sort?

[PokémonMaster]

I don't think they normally put it. You pretty much have to find the 2nd to last term yourself. Just practice. It gets alot easier.

The ones they usually ask for are 9, 10, and 11 terms, though, so I use these(might help, might not):

Sum of the first 9 terms = [unparseable or potentially dangerous latex formula]

Sum of the first 10 terms = [unparseable or potentially dangerous latex formula]

Sum of the first 11 terms = [unparseable or potentially dangerous latex formula]

Look around the forum. There are probably plenty of Fibonacci Sequence posts.