® The number of permutations of n different things, taken r at a time, where repeatition is allowed, is n r . ® The number of permutations of n objects taken all at a time, where p objects MATHEMATICS are of first kind, p objects are of the second kind, ..., p k objects are of the k th kind and rest, if any, are all different is ! ! !
📖 generic · CBSE Class 11 English medium · MATHEMATICS · Page 167question
® The number of permutations of n different things, taken r at a time, where
Chapter 2: 4 P 2 = 4 C 2 ××××× 2! or ( · MATHEMATICS
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