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There are 10 persons named P 1 , P 2 , P 3 , ... P 10 . Out of 10 persons,

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 in 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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