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# How many numbers of 'n' digits can be formed from the

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How many numbers of 'n' digits can be formed from the [#permalink]

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13 Mar 2004, 16:53
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How many numbers of 'n' digits can be formed from the nonzero digits in which no two consecutive digits are the same?

n^9
9^n
9*8^(n-1)
8^n
None of the above
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Pls include reasoning along with all answer posts.
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14 Mar 2004, 04:08
9*8^(n-1)

The rightmost slot can be filled with 9 different digits, the next to it with 8 digits. Repeat the same for all slots.
[#permalink] 14 Mar 2004, 04:08
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# How many numbers of 'n' digits can be formed from the

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