1.

For every a, b in N a" @ "b=a^(2)" when "(a+b)" is even" =a^(2)-b^(2)" when "(a+b)" is odd" a#b=b^(2)" when "axxb" is odd" =a^(2)-b^(2)" when "axxb" is even" Find the value of 20#(21" @ "22):

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0
2249
-1849
can't be determined

Answer :D


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