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Between stations A and B there 10 interm...

Between stations A and B there 10 intermediate stations. Find the number of ways in which a train can be stopped at 4 of these intermediate stations so that, no two stopping stations are adjacent ?
(Hint: Stop `rarr` S. Non stop `rarr` N we have to arrange SSSSNNNNNN letters so that no two S's are

Text Solution

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The correct Answer is:
`("^7P_4)/(4!)`
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