In how many ways 10 persons A1,A2,A3,….A...

In how many ways 10 persons `A_1,A_2,A_3,….A_(10)` can be arranged along a row in such a way that `A_2` must always occupy the middle place to that of `A_1,A_3`.

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The correct Answer is:

`2xxlfloor8`

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