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There are 10 persons named $P_1,P_2,P_3.....P_{10}$.Out of 10 persons,5 person are to be arranged in a line such that in each arrangement $P_1$ must occur where as $P_4$ and $P_5$ do not occur.Find the number of such possible arrangement.

$\begin{array}{1 1}(A)\;4200\\(B)\;4300\\(C)\;4400\\(D)\;4500\end{array} $

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