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In how many ways 10 persons A1,A2,A3,A4...

In how many ways 10 persons `A_1,A_2,A_3,A_4…….,A_(10)` can be seated along a row such that
`A_2,A_3,A_4` sit always after A1

Text Solution

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The correct Answer is:
`""^(10)P_6xxlfloor3`
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