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The number of permutations of n differe...

The number of permutations of `n` different things taking `r` at a time when 3 particular things are to be included is
a.`\ ^(n-3)P_(r-3)`
b. `\ ^(n-3)P_r`
c. `\ ^n P_(r-3)`
d. `\ r !^(n-3)C_(r-3)`

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