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[" 27.If "f:N rarr N," and "x(2)>x(1)rAr...

[" 27.If "f:N rarr N," and "x_(2)>x_(1)rArr f(x_(2))>f(x_(1)),quad AA x_(1),x_(2)in N" and "],[f(f(n))=3n,AA n in N," then "f(2)=]

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