題組內容

There are 7 problems in this test. No calculators are allowed. Write down detailed steps for the solution to each problem. Otherwise, no credits for that problem will be given.

2. Assume that a sequence of numbers is deined by x0 = 0, x1 = 1, and 61e1346a3d6c6.jpg = 61e13478d7dca.jpg > 1. Find generating function for the sequence, and then find an explicit expression for un.