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What is the total number of different divisors including 1

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What is the total number of different divisors including 1 [#permalink] New post 15 May 2005, 04:10
What is the total number of different divisors including 1 and the number that can divide the number 6400?
(1) 24 (2) 27 (3) 54 (4) 68
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 [#permalink] New post 15 May 2005, 04:26
27...

6400=2^8*5^2

(8+1)(2+1) because we have to include 1 and 6400, we add 1

so its 9*3=27...
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 [#permalink] New post 15 May 2005, 04:50
You are right Christoph!!
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 [#permalink] New post 18 May 2005, 03:02
27 it is, so the number itself is not a divisor
  [#permalink] 18 May 2005, 03:02
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