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 arrangement `P_1` must occur where as `P_4` and `P_5` do not occur. Find the number of such possible arrangements.

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The correct Answer is:

`= 4,200`

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