we have 6 machines the lifetime of each ~ exp(-ln(.7)=0.35) if one machine fail it is reapair the next day .What is the probability that some particular day NO machine work?? ./So far I got : If the lifetime is grater than the perticular day the probability = 0 I also think to separate the even days of the not even / Is this the right path ??
@Gmath This room is not intended for asking math questions. If you want an answer, I recommend going to the main math room or asking your question on the main site.
@Lord_Farin Do you think the room name should be made more descriptive? We had multiple visitors who inferred from the title that the room is where answers are given. Something like Review of unanswered questions...
room topic changed to The Crusade of Answers: Our menace: the Unanswered queue. Our goal: total annihilation! NB. This room is not for asking maths questions. (no tags)
room topic changed to The Crusade of Answers: Our menace: the Unanswered queue. Our goal: total annihilation! (NB. This room is not for asking maths questions.) (no tags)
@user79365 Meh. I've added a note in the room description.
@AndrewSalmon I could have used handwavery instead, but -- as I state in the last paragraph -- it may help people appreciate the standard methods of mathematical proof-writing.
(And when I was half-way through, there was no way I was going to stop.)
@AndrewSalmon I know, but I intentionally cut the corner of PropCalc. As for 12, I still needed to discharge 1. (By no means I claim that the proof is optimal.)
