Solve an=3an−1−4a_n = 3a_{n-1} - 4an=3an−1−4 with a0=5a_0 = 5a0=5. For which smallest nnn is an>200a_n > 200an>200?
n=3n = 3n=3
n=4n = 4n=4
n=5n = 5n=5
n=6n = 6n=6