Question
Suppose a sample space has things a, b, and c. Twice, draw from the sample space and replace. The possible sequences formed are {aa, ab,
Suppose a sample space has things a, b, and c. Twice, draw from the sample space and replace. The
possible sequences formed are {aa, ab, ac, ba, bb, bc, ca, cb, cc}.
Now suppose there are Y different things. There are Y ways the first draw can occur. For each of the Y
ways the first draw can occur, there are Y ways the second draw can occur, resulting in Y times Y, or
Y
sequences. For each of the Y
sequences formed from 2 draws, there are Y ways the 3rd draw can
2
2
occur forming Y
3
sequences. Generalizing, there are Y
X
sequences formed by drawing X times from Y
different things with replacement.
Example: The number of state license plates that can be made with 3 letters followed by 3 numbers is 26
x 26 x 26 x 10 x 10 x 10 = 26
3
x 10
3
= 17,576,000. From this one style of plate, there are many sequences.
How many sequences of 3 things can be formed from 7 different things with replacement and order is
important?
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