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Total number of permutations of 'k' diff...

Total number of permutations of 'k' different things, in a row, taken not more than 'r' at a time (each thing may be repeated any number of times) is equal to Options: 1.k^r -1 2. k^r 3.(k^r-1)/(k-1) 4.k(k^r-1)/k-1

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