Question 1072079
.
<pre>
1.  f(2) = f(1+1) = f(1) + f(1) ====>  f(2) = 2 + 2  = 4  ====>  


2.  f(3) = f(1 + 2) = f(1) + f(2) = 2 + 4 = 6.


<U>Answer</U>.  f(3) = 6.
</pre>