The increasing sequence of positive integers a_1, a_2, a_3,... has the property that
a_{n+2} = a_{n+1}+a_{n} for all n≥1. If a_7 = 120, then find a_8.
By using the recursion, $a_8 = 128$.
Incorrect. The reccursion does not give you that result :P.
