There are 10 different books in a shelf. If \( \mathrm{m} \) denote...

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There are 10 different books in a shelf. If \( \mathrm{m} \) denotes the number of ways of selecting 3 books when no two of them are consecutive and \( \mathrm{n} \) denotes the corresponding figure when exactly two are consecutive
\( \mathrm{P} \) then
(A) \( 8 m=7 n \)
(B) \( 6 m=5 n \)
(C) \( 7 \mathrm{~m}=5 \mathrm{n} \)
(D) \( m=n \)
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