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Permutations of n objects where p are alike and the rest all differ number:
An factorial plus p factorial
Bn factorial minus p factorial
Cn factorial over p factorial
Dn factorial times p factorial
Answer & Solution
Correct answer: C. n factorial over p factorial
1. Swapping the alike ones changes nothing.
2. So divide out their arrangements.
3. It is n factorial over p factorial.
_Source: NCERT Class 11 Mathematics, Chapter 7, Permutations and Combinations._
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