AP EAMCET · Maths · Permutation Combination
The total number of permutations of different things taken not more than at a time, when each thing may be repeated any number of times is
- A
- B
- C
- D None of these
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
When we arrange one things at a time, the number of possible permutations is n. When we arrange them two at a time the number of possible permutations are n×n=n2 and so on. Thus, the total number of permutations are n+n2+....+nr=n(nr-1)n-1 (∵n>1)
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