How to find the some of fibonacci

The Fibonacci numbers are 0, 1, 1, 2, 3, 5, 8, 13, ... They are defined recursively by the formula f1=1, f2=1, fn= fn-1 + fn-2 for n>=3.

pakistan's principal natural resources are arable land and water. about 25% of pakistan's agriculture accounts for about 21% [1] of gdp and employs about 43% of the labour force. in pakistan, the most agricultural province is punjab where wheat and cotton are the most grown.