Let m be the number of ways in which 'f'...

Let `m` be the number of ways in which `'f'` number of friends visit seven different wonders such that every friend visit at least one wonder. Let `n` be the number of ways in which all '`f`' friends visit exactly same two wonders.If `(n)/(m)=((21)/(127)^(4))` then value of '`f`' is.

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Let `m` be the number of ways in which `'f'` number of friends visit seven different wonders such that every friend visit at least one wonder. Let `n` be the number of ways in which all '`f`' friends visit exactly same two wonders.If `(n)/(m)=((21)/(127)^(4))` then value of '`f`' is.

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