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In how many 10 persons A1, A2, A3, ........

In how many 10 persons `A_1, A_2, A_3, ..... A_(10)` can be arranged along row in such a way that `A_2` must always occupy the middle place to that of `A_1, A_3.` (i) `20*8!` (ii) `20*7!` (iii) `40*7!` (iv) `2!`

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