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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] New post 13 Mar 2004, 15:53
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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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 [#permalink] New post 14 Mar 2004, 03:08
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, 03:08
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How many numbers of 'n' digits can be formed from the

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