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MTH 617 assignment 1

Question 1 Let p be a prime with p ≥ 5. Let S := {2,3,...,p−2}. Show that for any x S, there is a y S with y 6= x such that xy ≡ 1(modp).

Deduce that

(p − 2)! ≡ 1(modp).

Question 2 Let n be any odd positive integer. Is it true that

5|2016n + 6172n?

(Hint: The year ”2016” and the course number ”617” appearing in this question could simply be distractions. )

Question 3 Let. Show that G is a group under ordinary multiplication of real numbers.

Question 4 Let n be an integer with n ≥ 2. For a,b in Z, define

a ×n b := [ab]n.

Show that ×n is associative on Z.

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