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There are 10 persons named P1, P2, P3 .....

There are 10 persons named `P_1, P_2, P_3 ..., P_10`. Out of 10 persons, 5 persons are to be arranged in a line such that is each arrangement `P_1` must occur whereas `P_4` and `P_5` do not occur. Find the number of such possible arrangements.

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