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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
`A_2` must be seated after `A_1 and A_3` must come after `A_2`

Text Solution

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The correct Answer is:
`(lfloor15)/(lfloor3)`
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