$($a$)$ In each case below, state whether the statement is true or false. Justify your answer in each case. $($i$)2$ is a primitive element in Z$19.[5$ marks$]($ii$)($a$+$b$)-1=$ a$-1+6-7,$ for all non$-$zero a$,$ b in any field F with a$+$b$+0.[5$ marks$]=$