1.

Out of any seats located symmetrically about the middle of the row at least one is empty then total of ways of seating

Answer»

<P>`.^(m//2)C_(N).2^(n).n!`
`.^(m)P_(n)`
`.^(m//2)P_(n)`
`.^(m)P_(n)-.^(m//2)P_(n)`

ANSWER :a


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