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If the first and last digit must be a 2 or a 4, how many

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If the first and last digit must be a 2 or a 4, how many [#permalink] New post 07 Oct 2005, 08:45
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If the first and last digit must be a 2 or a 4, how many 5-digit numbers are possible?

A. 8,000
B. 16,000
C. 4,000
D. 5,750
E. 7,250
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 [#permalink] New post 07 Oct 2005, 08:49
c) 4000

2 possibilities for the 1st digit (2 or 4)
10 for the 2nd, 3rd and 4th digit each
2 for the last digit.

2*10*10*10*2 = 4000
  [#permalink] 07 Oct 2005, 08:49
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