Q:

1000 disks having 1,000,000-hour MTTF, if failed disks are being replaced with a new one, having the same as all having reliability characteristics, the number of disks that would be failed in a year (8760 hours) is

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1000 disks having 1,000,000-hour MTTF, if failed disks are being replaced with a new one, having the same as all having reliability characteristics, the number of disks that would be failed in a year (8760 hours) is


  1. 5
  2. 8
  3. 9
  4. 10

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 (c).9

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