The number of real roots of he equation ...

The number of real roots of he equation `1+a_(1)x+a_(2)x^(2)+………..+a_(n)x^(n)=0` where `|x|lt1/3` and `|a_(n)|lt2` is

n if n is even

0 for any natural number n

1 if n is odd

None of these

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