6 (a) Suppose that a,b,q and rare integers such that a=bq+r. Prove that D(b,r) D(a,b). (b) Prove Lemma 16.1.2 again from this. (In what sense is the equation a = bq+r (essentially) symmetric in a and r?) (c) Use the Euclidean Algorithm to compute g = gcd(1812, 1776). Reverse the Euclidean Algorithm to find integers m and n such that g=1812m + 1776n. (d) Use the Euclidean Algorithm to compute g = gcd(903, 714). Reverse the Euclidean Algorithm to find integers m and n such that g=903m+714n. Please answer all parts of the question. all consumers and (b) women made the acquisition of Geek Squad particularly important for Best Buy? 3 Based on the case information and what you know about consumer electronics, conduct an environ- mental scan for Geek Squad to identify key trends. For each of the five environmental forces (social, economic, technological, competitive, and regula- tory), identify trends likely to influence Geek Squad in the near future. 4 What promotional activities would you recom- mend to encourage consumers who currently use independent installers to switch to Geek Squad?