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Eamcet Mathematics
Algebra Permutations And Combinations
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Q.
The numbers of permutations of n things taken r at a time, when p things are always included, is
A.
B.
C.
D.
All of the above
E.
None of the above
View Answer
Correct choice: C
Explanation:
Since number of selections are
n-p
C
r-p
.
Therefore the arrangement of r things can be done in r !ways.
Hence the total permutations are
n-p
C
r-p
r!.
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