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NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Consider the following relations:

R$1=\{($a$,$ b$)$ in R$2$ a $>$ b$\},$ the greater than relation

R$2=\{($a$,$ b$)$ in R$2$ a $>=$ b$\},$ the greater than or equal to relation

R$3=\{($a$,$ b$)$ in R$2$ a $<$ b$\},$ the less than relation

R$4=\{($a$,$ b$)$ in R$2$ a $<=$ b$\},$ the less than or equal to relation

R$5=\{($a$,$ b$)$ in R$2$ a $=$ b$\},$ the equal to relation

R$6=\{($a$,$ b$)$ in R$2$ a $!=$ b$\},$ the unequal to relation

For these relations on the set of real numbers, find

R$1\backslash$cup R$5.$

Multiple Choice

R$1$

R$6$

R$2$

R$5$