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July 28, 2023
Permutation and Combination Formulas has been discussed on this page to help student remember all important formulas in last min before exam.
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Number of ways in which Permutations out of n things r things can be SELECTED & ARRANGED (denoted by nPr ).
nPr = number of permutations (arrangements) of n things taken r at a time.
^n P_r = \frac{n!}{(n-r)!} n ≥ rEg.
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