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Re: backup archive format saved to disk

Andrew Sackville-West wrote:
On Thu, Dec 07, 2006 at 08:41:23AM -0600, Mike McCarty wrote:

Andrew Sackville-West wrote:

On Wed, Dec 06, 2006 at 01:11:06PM -0600, Mike McCarty wrote:

Andrew Sackville-West wrote:

[Mike wrote]

So, the probability that at least one disc fails is 1-(1-p)(1-p).
For p = 0.01, that is 0.0199.


you aren't using an old pentium are you? ;-)

If p = 0.01, then (1-p) = 0.99, and (1-p)(1-p) = 0.9801, so that
1 - (1-p)(1-p) = 0.0199 exactly.

that was a joke...

Sorry, missed that.


If the probability of the first one failing is 60% and the probability
of the second one failing is 60%, then I suppose you believe that the
probability of one or the other or both failing is 120%.

no I don't. consider me thinking aloud.

Now you missed *my* joke! Sorry, I shoulda put in a smiley.


NB: 1 - (1-p)^2 = 1 - (1 - 2p + p^2) = 2p - p^2, as computed

doesn't this involve pascal's triangle somewhere? my brain is too
fuzzy for this stuff. I need to get a good book and retrain my brain.

Everything involves Pascal's triangle somewhere :-)

thanks for the refresher!

Sorry, my grad schooling is in Mathematical Probability and Statistics.
I almost got a Ph.D (a kid suddenly came along, and I had to get a
real job), but was in a program which only made Ph.Ds,
so I didn't wind up with an MSc. along the way, which I have certainly
exceeded the normal requirements for :-(

This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!

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