A={(9,1),(8,2),(7,3),(6,4),(5,5),(4,6),(3,7),(2,8) ,(1,9)} I am not sure how to write its set builder notation but I have tried it as follows A = {(a,b)| ai<10 and bi>0, 0<i<10} Any suggestion would be highly appreciated.
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Originally Posted by mrsenim A={(9,1),(8,2),(7,3),(6,4),(5,5),(4,6),(3,7),(2,8) ,(1,9)} I am not sure how to write its set builder notation $\displaystyle A=\{(10-k,k):k=1,2,\cdots,9\}$ That is one of several ways.
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