document.pdf - Adobe Acrobat Reader DC File Edit View Window Help ? Tools Sign In Home document.pdf Share 11 125% Search 'Edit Image' LExport PDF Adobe Export PDF Convert PDF Files to Word or Excel Online Select PDF File (1) Let Z7 {0,1, 2, 3, 4,5,6} document.pdf X (a) Write out the addition and multiplication tables for Z, and use your answer to find -2 and 2- in Z7 (b) compute 22 and 23 in Z7, and use this to give another calculation of 2-1 in Z7 (c) Let p be a prime number, and let a E Zp = {0,1,..., p - 1} such that a0. Prove that there is a positive integer n

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