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Find the number of ways of arranging 15 ...

Find the number of ways of arranging 15 students `A_1,A_2,........A_15` in a row such that (i) `A_2`, must be seated after `A_1 and A_2`, must come after `A_2` (ii) neither `A_2` nor `A_3` seated brfore `A_1`

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