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. 
7. Let m and n be two positive integers, m ≤ n. Define 61e136ad50c63.jpg

(b) Show that if n is composite, then n does not divide 61e136eb9f44b.jpgfor some i, 1 ≤i ＜n.