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The total number of permutations of n (> 1) Different things taken not more than r at a time, when each thing may be repeated any number of times is
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a
n(nn−1)n−1
b
nr−1n−1
c
n(nr−1)n−1
d
None of these
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Correct option is C
When we arrange one thing at a time, the number of possible permutations is n. When we arrange them twoat a time the number of possible permutations are n x n=n2 and so on. Thus, the total number ofpermutations are n+n2+…+nr=n(nr−1)n−1 [∵n>1]Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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