Question #287019

{F} How many different sequences, each of length r, can be formed using elements

from A if

(a) elements in the sequence may be repeated?

(b) all elements in the sequence must be distinct?


1
Expert's answer
2022-01-31T09:40:15-0500

Let the set AA consist of nn distinct elements and let nrn\geq r,

a)a)

When the elements in the sequence may be repeated, then we have nrn^r sequences each of length r.r.


b)b)

When the elements in the sequence can not be repeated(distinct) then, there will be nPr=n!(nr)!^nP_r={n!\over (n-r)!} sequences each of length rr.


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