let Δ={(x,y)∈N^2 /x+y=n , n∈N} find cardΔ 2) let A= {(x,y)∈N^2 / x+2y=n} find card A.


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Question Number 31047 by abdo imad last updated on 02/Mar/18
$let Δ={(x,y)∈N^2 /x+y=n , n∈N} find cardΔ 2) let A= {(x,y)∈N^2 / x+2y=n} find card A.$
$l e t Δ = {(x, y) \in N^{2} / x + y = n, n \in N} f i n d c a r d Δ$ $2) l e t A = {(x, y) \in N^{2} / x + 2 y = n} f i n d c a r d A .$
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