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If f: NrarrN,and x2> x1=> f(x2)>f(x1) fo...

If `f: NrarrN`,and `x_2> x_1=> f(x_2)>f(x_1)` for `x_1,x_2 in N` a n d`f(f(n))=2nAAn in N ,` then `f(2)`=_________`

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