For natural numbers \( m, n \), if \( (1-y)^{m}(1+y)^{n}=1+a_{1} y \) \( +a_{2} y^{2}+\cdots \),...
For natural numbers \( m, n \), if \( (1-y)^{m}(1+y)^{n}=1+a_{1} y \) \( +a_{2} y^{2}+\cdots \), and \( a_{1}=a_{2}=10 \), then
(1) \( mn \)
(2) \( mn \)
(3) \( m+n=80 \)
(4) \( m-n=20 \)
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