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CBSE XI
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Math
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Permutations and Combinations
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Find the number of permutations of n distinct things taken r together in which 3 particular things must occur together.
$\begin{array}{1 1}(A)\;n-3C_{r-3}(r-2)!3!\\(B)\;nC_r\\(C)\;n-1C_{r-1}\\(D)\;n-2C_{r-3}\end{array} $
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